How do I check remaining data and top up a Türk Telekom tourist SIM card in Turkey?

The most reliable method for Türk Telekom is the official app. Open the Mobil section, enter your phone number, and tap Şifre Al; you’ll receive a one-time SMS code to sign in.

If a Türk Telekom SIM stops working after some time, checking the balance and topping up usually starts by signing into the app with the phone number. Without logging in by number, you generally can’t see the remaining package.

You don’t need a permanent password: the app sends a verification code by SMS to the SIM itself. That’s convenient for travelers, but it only works if you know the SIM’s phone number.

If you bought the SIM at the airport and weren’t given a slip or card with the number, that becomes the main problem: without the number, you can’t properly log into the app to monitor remaining data.