These two ways of connecting your phone to a cellular network are very different. We tell you about each and how you can switch from one to another.

Your new device may not even support physical SIMs! Don't worry, we can show you how to transfer an eSIM to a new iPhone.

If you don't own an iPhone, Pixel, or Samsung, another way you can find your SIM card's ICCID number is by using the secret short codes for Android, particularly the Man-Machine Interface (MMI) code.

A SIM built into your phone, or one you insert. What's the difference between the two mobile connections? Here's everything ...