Introduction
Roaming services in Turkey are an important legal and consumer protection issue for mobile subscribers, telecom operators, tourists, business travelers, foreign residents, students, logistics companies, IoT providers, eSIM platforms, connected vehicle companies and multinational businesses. Roaming allows a mobile subscriber to use voice, SMS and mobile data services outside the coverage area of their home network by connecting to another operator’s network. In practice, roaming is most commonly discussed as international roaming, where a Turkish mobile subscriber uses their Turkish line abroad or a foreign subscriber uses a foreign line in Turkey.
Roaming creates convenience, but it also creates legal and financial risk. Consumers may face unexpectedly high invoices. Devices in border areas may connect automatically to a foreign network even when the user is physically in Turkey. Mobile data may continue running in the background. A traveler may assume that their domestic package is valid abroad when it is not. A company may deploy IoT devices in Turkey using foreign SIM or eSIM profiles and later discover that permanent roaming is restricted. A foreign tourist may use roaming in Turkey without understanding IMEI and eSIM-related limitations.
In Turkey, roaming services are regulated mainly through Law No. 5809 on Electronic Communications, BTK regulations and decisions, consumer protection rules, subscription contract principles, billing transparency obligations, personal data protection law and, for certain technical models, eSIM and permanent roaming restrictions. The Information and Communication Technologies Authority, known as BTK, is the main regulatory authority. BTK explains that a Turkish subscriber may use mobile services abroad through the infrastructure of an operator with which the Turkish operator has a roaming agreement, but the subscriber’s line must be open to international roaming. BTK also warns that making calls, receiving calls and using data abroad may be more expensive than domestic use and may cause high invoices.
This guide explains the legal framework and consumer protection rules for roaming services in Turkey from the perspective of consumers, telecom operators, foreign visitors, corporate users, IoT companies and technology businesses.
What Is Roaming?
Roaming is the ability of a mobile subscriber to use mobile services outside the home operator’s own network coverage by connecting to another operator’s network. In international roaming, the subscriber uses the network of a foreign operator while keeping their own mobile number and subscription relationship with the home operator.
For example, a subscriber of a Turkish mobile operator traveling to Germany may connect to a German operator’s network and use voice, SMS and data through roaming. Similarly, a subscriber of a European operator traveling to Turkey may connect to a Turkish mobile network and use services under the terms of their foreign operator’s roaming arrangements.
Roaming can include:
Voice calls made abroad.
Voice calls received abroad.
SMS sent abroad.
SMS received abroad.
Mobile data use abroad.
MMS or value-added services abroad.
Emergency communication.
Corporate mobile connectivity.
IoT and machine-to-machine connectivity.
eSIM-based travel data packages.
Connected vehicle connectivity.
The legal and financial consequences depend on the subscriber’s tariff, roaming package, destination country, operator agreements, data use, device settings and applicable regulatory rules.
Roaming under Turkish Telecommunications Law
Turkish telecommunications law does not treat roaming merely as a commercial feature. It is part of the regulated electronic communications sector. Law No. 5809 and BTK regulations apply to mobile operators, subscriber contracts, consumer information, billing, data processing, network security, international roaming agreements and operator obligations.
BTK’s consumer guidance explains that subscribers can benefit from roaming services abroad only if their line is open to international roaming. Through roaming, subscribers may make and receive calls, send messages and access the internet through their own line while abroad.
This means that roaming requires at least three legal layers:
The subscription relationship between the consumer and the home operator.
The commercial and technical roaming agreement between the home operator and the visited operator.
The regulatory framework protecting the consumer against unfair billing, insufficient information, unauthorized activation, excessive charges and service-quality disputes.
For operators, roaming also creates obligations relating to transparency, tariff information, billing accuracy, complaint handling, personal data security and cooperation with foreign networks.
International Roaming for Turkish Subscribers
A Turkish subscriber traveling abroad should first check whether international roaming is active on the line. If roaming is closed, the subscriber may not be able to use foreign mobile networks through their Turkish SIM. If roaming is open, the subscriber may use mobile services abroad but may incur additional charges depending on the tariff and roaming package.
BTK warns that, when abroad, even receiving calls may be charged, and international roaming call, received-call and data usage fees may be higher than domestic prices, depending on the country.
This is one of the most important consumer protection points. Many subscribers know that making calls abroad may cost extra, but they may not realize that receiving calls abroad can also be charged. Similarly, mobile applications may use data in the background for updates, cloud synchronization, maps, messaging, e-mail, photo backup and notifications. A consumer who does not actively browse the internet may still generate roaming data charges.
Before traveling, subscribers should:
Check whether roaming is open.
Review destination-country roaming prices.
Purchase a roaming package if needed.
Turn off mobile data roaming unless necessary.
Use Wi-Fi where safe.
Disable automatic app updates.
Check whether receiving calls is charged.
Review SMS and data rates.
Set invoice alerts or spending limits.
Select the operator manually if near borders.
The legal problem usually begins when the consumer was not adequately informed or when the charge was triggered without meaningful consent or reasonable notice.
Roaming for Foreign Visitors in Turkey
Foreign visitors to Turkey may use their home operator’s roaming service by connecting to Turkish mobile networks. This may be convenient for tourists and business travelers, but it can be expensive depending on the visitor’s home operator and roaming plan. Foreign visitors should check their home operator’s rates before arriving in Turkey.
Foreign visitors should also be aware of device and eSIM-related issues. Turkey has specific rules on IMEI registration and remote programmable SIM technologies. BTK’s eSIM decision limits international roaming data service for devices manufactured for use in Turkey, imported into Turkey or brought by passengers to the IMEI registration period of 120 days.
This rule is especially relevant for long-term foreign residents, students, expatriates and businesses using foreign eSIM or foreign SIM profiles in Turkey. Short-term roaming for travel is different from long-term or permanent use of foreign mobile connectivity in Turkey. A tourist may use roaming temporarily, but a device intended to operate in Turkey permanently may need a Turkish operator profile and proper registration.
Roaming Charges and Bill Shock
The most common consumer dispute in roaming is the high invoice, often called “bill shock.” Bill shock occurs when the subscriber receives an unexpectedly high bill due to roaming calls, received calls, data usage, package overrun, automatic daily roaming packages, background data, border-area roaming or misunderstanding of tariff terms.
BTK’s consumer page specifically warns subscribers that roaming services abroad may result in high bills because roaming call, received-call and data charges may be higher than domestic charges.
Common causes of roaming bill shock include:
No roaming package purchased.
Automatic daily roaming package activation.
Background mobile data usage.
Video streaming abroad.
Map navigation and location services.
Cloud photo backup.
Receiving long calls abroad.
Using mobile hotspot abroad.
Children using mobile data abroad.
Border-area connection to a foreign network.
Cruise ship or aircraft network charges.
Misunderstanding of “domestic package abroad” campaigns.
The legal assessment depends on whether the operator properly informed the subscriber, whether the charges were consistent with the tariff, whether the service was activated with consent, whether alerts were sent, whether the subscriber had set a spending limit, and whether the usage records are accurate.
Operator Information Obligations
Operators must provide clear and accessible information about roaming tariffs, packages, activation conditions, cancellation, package limits, overage charges, countries included in the package and billing consequences. Consumers should not have to discover roaming costs only after receiving a high invoice.
BTK’s consumer guidance emphasizes that subscribers should read subscription agreements carefully, ensure that the correct tariff is written in the contract and ask the operator or dealer to provide all information, especially service scope and fees, before entering into obligations.
In the roaming context, this means that operators should clearly disclose:
Whether international roaming is active.
Which countries are covered by the package.
Daily, weekly or monthly package fees.
Whether the package renews automatically.
Whether unused rights expire.
Data limits.
Overage charges.
Call receiving charges.
SMS charges.
Aircraft and maritime roaming exclusions.
Border-area risk.
How to close roaming.
How to set invoice limits.
How to object to charges.
Unclear or misleading information may support a consumer’s objection to roaming charges.
Invoice Upper Limit and Usage Alerts
Bill-control mechanisms are central to roaming consumer protection. BTK’s consumer guidance states that operators with more than 200,000 subscribers must inform subscribers when charges included in the invoice upper limit reach TRY 100, unless the subscriber chooses another lower or higher threshold; subscribers can also query current invoice amounts free of charge through operators’ websites or by SMS for mobile subscribers.
This rule is significant for roaming disputes because high roaming invoices often occur rapidly. If the operator failed to send required alerts, sent them late, or did not allow the subscriber to control spending, the consumer may argue that the operator breached its information and consumer protection obligations.
However, not every high invoice is automatically unlawful. The consumer’s package, alerts, usage records, destination country, device settings and operator notifications must be reviewed. The key question is whether the operator complied with legal and contractual information duties and whether the subscriber had a meaningful opportunity to prevent further charges.
Border-Area Roaming
Border-area roaming is a special problem in Turkey. Subscribers living in or visiting coastal regions, border provinces or islands may sometimes connect to foreign networks without leaving Turkey. This can happen when the device is set to automatic network selection and a foreign base station signal is stronger than the domestic network signal.
BTK’s consumer guidance warns that if a line is open to international roaming, citizens living in coastal or border regions may receive service through foreign operators and face high invoices. BTK recommends that subscribers either close international roaming through their operator or manually select their domestic network through device settings to prevent automatic connection to foreign networks.
Border-area roaming disputes may arise in places near Greece, Bulgaria, Georgia, Armenia, Iran, Iraq, Syria, Cyprus or coastal areas where foreign network signals may reach Turkish territory. A subscriber may argue that they never traveled abroad and that roaming charges were unexpected. The operator may rely on network records showing connection to a foreign operator.
In such disputes, evidence is crucial. The consumer should gather:
Location records.
Travel records.
Passport entry-exit records.
Screenshots of network name.
SMS warnings received.
Invoice details.
Roaming usage times.
Device network settings.
Operator complaint records.
If the subscriber was physically in Turkey and no effective warning was provided, the consumer may have stronger grounds to object.
Manual Network Selection as a Preventive Measure
One practical way to prevent accidental roaming is manual network selection. BTK expressly recommends that subscribers in border or coastal areas select their own domestic network operator manually through device settings if they do not want the device to switch automatically to a foreign network.
Manual network selection is especially important for:
Residents of border provinces.
Hotels near borders.
Ferries and coastal travelers.
Truck drivers.
Tour buses.
Students in border cities.
Businesses operating near foreign network coverage.
IoT devices near borders.
Fleet tracking devices.
Connected vehicle systems.
Businesses should train employees and drivers on this issue. Corporate phone policies should specify whether roaming is allowed, whether data roaming is disabled by default, and whether manual network selection is required in border regions.
Roaming Packages and Campaign Terms
Operators often offer roaming packages. These may be daily packages, country-specific packages, regional packages, data-only packages, voice packages, business travel packages or “use your domestic tariff abroad” campaigns. These packages can reduce cost but may also create disputes if terms are unclear.
Roaming package terms should explain:
Countries included.
Excluded countries.
Daily activation fee.
Whether fee applies automatically upon first use.
Whether package renews daily.
Data limit.
Speed reduction or overage price.
Call and SMS rules.
Receiving call charges.
Validity period.
Cancellation method.
Whether package works on aircraft or cruise ships.
Whether business or consumer lines differ.
Consumers should not assume that a roaming package covers all countries. For example, a package may cover certain European countries but not Northern Cyprus, Serbia, Switzerland, the United Kingdom, Gulf countries, aircraft networks or maritime networks. Operators should make the scope clear.
EU Roaming Rules and Turkey
Consumers sometimes assume that European Union “roam like at home” rules apply in Turkey. This assumption can be costly. EU rules provide that when consumers travel from one EU country to another EU country, roaming calls, SMS and data are charged at domestic rates under the “roam like at home” framework.
Turkey is not part of the EU roaming area for this purpose. Therefore, EU subscribers traveling to Turkey and Turkish subscribers traveling to EU countries should not assume that EU-style roaming protections automatically apply. The applicable charges depend on the home operator’s tariff, roaming package and bilateral agreements.
This is particularly important for tourists from EU countries visiting Turkey. They should check Turkey-specific roaming charges before travel or purchase a suitable travel package.
Permanent Roaming and IoT Devices
Roaming is generally designed for temporary use outside the home network. Permanent roaming is different. It occurs when a device uses a foreign SIM or foreign eSIM profile in another country on a long-term or continuous basis. This issue is especially important for IoT, connected vehicles, smart meters, logistics trackers, POS devices, industrial sensors and telematics devices.
BTK’s 2019 eSIM decision states that devices manufactured for use in Turkey, imported into Turkey or brought by passengers may receive international roaming data service only for the IMEI registration period of 120 days. It also requires remote programmable SIM technologies used in Turkey to be programmable under Turkish mobile operator control and to allow Turkish mobile operator profiles for domestic use.
This creates important legal risk for global IoT providers. A company that deploys thousands of devices in Turkey with foreign eSIM profiles may face regulatory problems if the model relies on permanent roaming. The safer approach is to analyze whether Turkish operator connectivity, local eSIM infrastructure, MVNO arrangements or local telecom authorization is required.
Roaming and eSIM Travel Services
eSIM travel services are popular because they allow users to download a data profile before or during travel. However, Turkey’s eSIM framework requires careful analysis. BTK’s eSIM decision states that remote programmable SIM systems, subscription management components, software, platforms and storage units must be established within Turkey by authorized operators or by third parties under operators’ full responsibility, and that all data must be kept within Turkey for the relevant Turkish eSIM infrastructure.
This does not mean that every short-term travel eSIM is automatically unlawful in all circumstances, but it does mean that permanent or Turkey-targeted eSIM business models should be reviewed carefully. Foreign eSIM providers, device manufacturers, IoT companies and travel data platforms should not assume that a global model used elsewhere can be applied in Turkey without local telecom analysis.
Consumers should also be cautious. Some travel eSIM services may function only temporarily or may be affected by Turkish device, IMEI, roaming and operator rules.
Corporate Roaming Policies
Companies should manage roaming through written policies. Employees traveling abroad may generate high invoices if roaming is not controlled. Corporate lines may also be used by field teams, executives, drivers, sales staff and technicians. Without controls, a single trip can create large charges.
A corporate roaming policy should address:
Who may use roaming.
Which countries are covered.
Whether roaming must be approved before travel.
Whether roaming packages are mandatory.
Data limits.
Hotspot use.
Video streaming restrictions.
Device settings.
Manual network selection near borders.
Reporting lost devices abroad.
Emergency communication.
Invoice review.
Employee reimbursement.
Corporate liability.
Companies should also monitor invoices and set alerts. If an employee receives roaming warnings or unusually high charges, the company should intervene before the bill grows.
Roaming for Logistics and Transportation Companies
Roaming is particularly important for logistics, transport, shipping, aviation, tourism and international trade companies. Trucks, buses, ferries, cargo vehicles and connected fleet devices may cross borders frequently. Devices may connect to multiple networks in short periods. Border-area roaming may occur even without a formal border crossing.
Fleet operators should evaluate:
SIM type.
Roaming package.
Data use.
Telematics device settings.
eSIM restrictions.
Permanent roaming risk.
Cross-border routes.
Device IMEI status.
Local SIM alternatives.
Data processing.
Driver communication.
Emergency backup communication.
A fleet tracking device using a foreign SIM in Turkey continuously may trigger different legal issues than a driver’s temporary phone roaming during a trip.
Roaming and Personal Data Protection
Roaming involves personal data processing. Operators may process phone numbers, location-related data, network connection data, usage records, billing data, roaming partner information, IP addresses and customer complaint records. In some cases, data may be exchanged between home and visited operators.
Under KVKK, data controllers must take necessary technical and organizational measures to provide an appropriate level of security, prevent unlawful processing, prevent unlawful access and ensure protection of personal data.
Roaming data can reveal sensitive movement patterns. It may show that a person was in a specific country, near a border, at an airport, on a ship, or in a particular region at a specific time. Operators should therefore limit access to roaming records, use them only for lawful purposes, secure them against unauthorized access and retain them only as required by law and legitimate business needs.
If a roaming-related data breach occurs, KVKK breach notification rules may become relevant. The Personal Data Protection Authority states that if notification cannot be made within 72 hours for a justified reason, the reason for delay must be explained.
Roaming Billing Disputes
Roaming billing disputes should be handled systematically. A consumer who receives a high roaming invoice should first request detailed billing and usage records from the operator. The request should identify the disputed charges and ask for explanation of country, visited network, date, time, data amount, call duration, SMS count, package activation and alert messages.
The consumer should ask:
Was international roaming active?
When was it activated?
Was any roaming package applied?
Was the package activated automatically?
Which foreign network was used?
Was the consumer abroad?
Were warning SMS messages sent?
Was data roaming active?
Were invoice upper-limit notifications sent?
Did the operator receive any complaint before billing?
Was there a technical error?
If the operator’s response is insufficient, the consumer may use BTK complaint channels and consumer remedies.
BTK Complaint Route
BTK provides a consumer complaint system through e-Government for telecom disputes. A roaming-related complaint may concern high invoices, lack of warnings, unauthorized roaming activation, border-area roaming, incorrect package application, failure to close roaming, misleading tariff information, or refusal to investigate disputed charges.
A strong BTK complaint should include:
Subscriber information.
Invoice date and amount.
Disputed roaming amount.
Country or location.
Travel dates.
Passport entry-exit information, if relevant.
Screenshots of network connection.
SMS warnings received or not received.
Operator complaint number.
Detailed invoice.
Requested correction or refund.
BTK complaints are especially useful where the issue concerns operator conduct, billing transparency, information duties or failure to resolve the dispute.
Consumer Arbitration and Court Remedies
If the dispute is monetary, the consumer may also apply to the consumer arbitration committee or consumer court depending on the value. For 2026, the Ministry of Trade states that disputes below TRY 186,000 fall within the jurisdiction of provincial or district consumer arbitration committees, while disputes at or above TRY 186,000 cannot be decided by consumer arbitration committees and should proceed through mandatory mediation and consumer courts where applicable.
Many roaming disputes fall below this threshold and may therefore be suitable for consumer arbitration. The consumer should attach invoices, operator responses, travel records, screenshots, SMS warnings, complaint records and a clear explanation of why the charge is disputed.
For corporate subscribers, the legal route may differ because the subscriber may not be a consumer under Law No. 6502. Corporate disputes may require commercial negotiation, general courts, commercial courts or arbitration depending on the contract.
Legal Arguments in Roaming Disputes
Possible legal arguments in roaming disputes may include:
The subscriber did not activate international roaming.
The operator failed to inform the subscriber clearly.
The package terms were misleading.
The roaming package was activated without consent.
The charge arose from border-area roaming while the subscriber was in Turkey.
The operator failed to send required alerts.
The operator failed to apply the correct package.
The invoice exceeded the applicable spending limit without proper notice.
The operator failed to close roaming after request.
The detailed usage records are inconsistent.
The consumer was charged after termination.
The operator failed to investigate the complaint.
Each case depends on evidence. Consumers should avoid general complaints such as “the bill is too high” and instead identify the legal and factual problem.
Operator Compliance Checklist
Mobile operators providing roaming services should implement:
Clear roaming tariff pages.
Destination-country price information.
Package scope disclosures.
SMS warnings upon arrival abroad.
Invoice upper-limit alerts.
Free current invoice inquiry tools.
Easy roaming closure and activation methods.
Manual network selection guidance for border areas.
Complaint handling procedures.
Detailed billing access.
Accurate visited-network records.
Consumer-friendly dispute review.
Dealer and call center training.
KVKK-compliant data processing.
Secure roaming records.
Clear corporate roaming controls.
Operators should also maintain evidence that information was provided and alerts were sent.
Consumer Checklist before Travel
Consumers should take the following steps before international travel:
Check whether roaming is open.
Review destination-country charges.
Buy a roaming package if necessary.
Confirm whether receiving calls is charged.
Turn off data roaming unless needed.
Disable automatic updates and cloud backup.
Set invoice alerts.
Save operator customer service numbers.
Check aircraft and maritime roaming exclusions.
Use manual network selection near borders.
Use Wi-Fi carefully and securely.
Monitor current invoice amount.
Keep SMS warnings.
These steps reduce the risk of unexpected bills and strengthen the consumer’s position if a dispute occurs.
Checklist for Border Regions
Subscribers living or working near borders should:
Close international roaming if not needed.
Select the Turkish operator manually.
Monitor the network name displayed on the device.
Avoid automatic network selection.
Warn family members and employees.
Check invoices regularly.
Take screenshots if the device connects to a foreign network while in Turkey.
Object immediately to suspicious roaming charges.
This is especially important in coastal, island, ferry, port and border-adjacent locations.
Checklist for IoT and eSIM Companies
Companies using roaming-based connectivity in Turkey should:
Determine whether the use is temporary or permanent.
Review BTK’s eSIM decision.
Analyze IMEI registration period.
Check whether Turkish operator profiles are required.
Avoid permanent foreign roaming without legal review.
Review MVNO and local operator options.
Map data flows.
Review KVKK compliance.
Clarify who is the telecom service provider.
Draft contracts addressing roaming restrictions.
Prepare device replacement or local SIM migration plans.
For IoT projects, the legal analysis should be completed before importing devices or signing global connectivity contracts.
Conclusion
Roaming services in Turkey are legally and commercially important because they combine telecom regulation, consumer protection, billing transparency, international operator agreements, device settings, eSIM rules, IMEI limitations, personal data protection and dispute resolution. Roaming allows mobile users to stay connected abroad, but it can also create high invoices and legal disputes if users are not properly informed or if services are triggered unexpectedly.
BTK’s consumer guidance makes two practical points clear: international roaming must be active for the subscriber to use foreign networks, and roaming calls, received calls and data usage may be more expensive than domestic use and may lead to high bills.
For consumers, the safest approach is to check roaming status, review country-specific prices, purchase suitable packages, disable data roaming when unnecessary, use manual network selection near borders and preserve evidence in case of billing disputes. For operators, the key compliance duties are transparency, timely warnings, accurate billing, easy service control, complaint handling and data security.
For technology companies, IoT providers and eSIM platforms, the most important issue is that roaming is not always a long-term connectivity solution in Turkey. BTK’s eSIM decision creates restrictions on permanent foreign profiles, local infrastructure, data localization and the 120-day IMEI-related international roaming data period.
A legally sound roaming strategy in Turkey requires correct classification, clear contracts, consumer-friendly information, technical controls, KVKK compliance and evidence-based dispute management. Businesses and consumers that understand these rules can reduce cost, avoid conflict and use roaming services more safely.
Frequently Asked Questions
What is roaming in Turkey?
Roaming is the ability to use mobile voice, SMS and data services through another operator’s network, usually when traveling abroad. A Turkish subscriber can use roaming abroad if the line is open to international roaming.
Is receiving calls abroad charged?
It may be charged. BTK warns that when abroad, receiving calls as well as making calls may be subject to fees, and roaming charges may be higher than domestic charges.
Why can roaming bills be very high?
Roaming bills may be high because international call, received-call and data rates can be higher than domestic tariffs, and mobile data may continue in the background through apps, maps, cloud backups and notifications.
What is border-area roaming?
Border-area roaming occurs when a device connects to a foreign network while the user is near a border or coastal area, sometimes even while physically in Turkey. BTK recommends closing roaming or manually selecting the domestic operator to prevent this.
How can consumers prevent accidental roaming near borders?
Consumers can close international roaming through their operator or manually select their Turkish network from device settings instead of using automatic network selection.
Does EU “roam like at home” apply in Turkey?
No. EU “roam like at home” rules apply when traveling from one EU country to another EU country. Turkey is not part of that EU roaming area.
What should I do if I receive a high roaming bill?
You should request detailed billing from the operator, object in writing, preserve SMS warnings and travel records, ask whether alerts were sent, file a BTK complaint if necessary, and apply to the consumer arbitration committee or court depending on the dispute value.
What is the consumer arbitration threshold for 2026?
For 2026, disputes below TRY 186,000 fall within provincial or district consumer arbitration committees; disputes at or above that amount cannot be decided by consumer arbitration committees.
Can IoT devices use foreign SIMs permanently in Turkey?
Permanent foreign roaming for IoT devices may create regulatory risk. BTK’s eSIM decision limits international roaming data service for relevant devices to the 120-day IMEI registration period and requires Turkish operator control for domestic eSIM profiles.
Does KVKK apply to roaming records?
Yes. Roaming records may include phone numbers, location-related data, network records, billing data and usage information. Operators must take technical and organizational measures to secure personal data under KVKK.
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