Using an Unregistered iPhone in Turkey (2026): IMEI, BTK Registration, 120-Day Rule and eSIM Reality
When you bring an iPhone from abroad and try to use it in Turkey, you quickly face IMEI registration requirements, the 120-day temporary usage rule, and regulations enforced by the Information and Communication Technologies Authority (BTK). With increasing registration fees and stricter controls in recent years, many users are asking a clear question: How does an iPhone without IMEI registration work in Turkey? In this article, I examine the technical foundation of the IMEI system, its relationship with the iOS ecosystem, and the registration process implemented in Turkey. I also explain the functional limitations of an unregistered device and the technical logic behind temporary usage periods such as physical SIM and eSIM transitions. The purpose is not to bypass any system, but to understand how the system technically operates. IMEI System and Its Historical Development: The Evolution of Mobile Identity With the development of mobile communication technologies, it has become inevitab...