: It is designed to bypass network restrictions on ZTE handsets, allowing them to accept SIM cards from different carriers. Version 17

If you have a ZTE phone running Android 10/11:

Since the official ZTE app may no longer be available on the Play Store, you can download the ZTE Calculator v17 APK from trusted third-party archives (e.g., APKMirror, APKPure). Always scan files with antivirus before installing.