You'll need your iPhone's IMEI number if you want to unlock it and use it on a different cellular provider.

If you need to find out your iPhone's carrier without a SIM card installed, you can do so through the Settings app.

The International Mobile Equipment Identity (IMEI) number is a unique 15-digit code used to distinguish your device from others. It plays a crucial role in protecting your phone and ensuring proper ...

What is a SIM card used for? A SIM card, or a subscriber identity module/subscriber identification module, is a tiny memory card that contains unique information and is linked to a particular network ...