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An IMEI (International Mobile Equipment Identity) number is a unique identifier assigned to every mobile device. Some devices have a 15-digit IMEI number while others are made up of a 16-digit code.

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.

If your new phone no longer supports SIM cards, or you don't want to use them anymore, you can convert to eSIM instead.