The SIM Card
Like most current mobile phones, the iPhone uses a SIM (Subscriber Identity Module) card. These cards store your name and phone number, and they may store additional data, such as a contacts list.
Decide If You Should Remove Your SIM Card
The SIM card is removable. Here are some reasons why you might want to remove it:
If you are sending your iPhone in for repair or a battery replacement, you can first remove the SIM card and then temporarily use it in another phone. Plus, removal prevents anyone else from stealing the card or using it to make calls while the phone is out of your possession.
If you have a new iPhone, you can (sometimes) get it ready for action instantly by removing the card from an old iPhone and putting it in the new ...
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