Install a SIM card in your phone to enable full device capabilities, and make sure to power it down before proceeding. Use a SIM card removal tool or a sewing needle to open the SIM card tray, and ...

To remove the SIM card from your iPhone, you'll need to eject the SIM card tray with a special tool or paperclip.

To unlock your iPhone from its carrier, you'll likely need to contact your carrier directly to cancel your contract.

The subscriber identity module -- SIM -- contains the information used to connect to your wireless carrier's network from your iPhone 4. If you are planning to resell your company's iPhones, you ...

All iPhones and iPads with cellular have a slot on their sides that houses the Subscriber Identity Module (SIM) card provided by your mobile carrier. The SIM card enables your device to access the ...