SIM stores information your device uses to connect to a carrier's mobile network. It also identifies your device and your plan with the carrier.
SIM can be stored on either:
- A removable, physical SIM card
- A built-in, digital, embedded SIM (aka eSIM)
Note: SIM doesn't store apps or media. If your device has a memory card slot you may be able to increase storage space with a new memory card.