Most cellphones, including Apple's iPhone, require a SIM card to receive service. SIM cards are small cards inserted inside cellphones that identify the subscriber and hold information. SIM cards are pre-installed in iPhones, but sometimes need to be replaced due to damage or a new user. They can be easily registered before use with iTunes.
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Things you need
- USB cable
Straighten the end of a paper clip.
Poke the small hole on the right side of the iPhone if using an iPhone 4 or the top if using an iPhone 3G or 3GS with the paper clip. A tray will open.
Insert the SIM card into the tray and replace it.
Open iTunes on a computer.
Plug the appropriate ends of the USB cable into the iPhone and the computer. After a few seconds, the iPhone and a registration form will appear in iTunes.
Fill out the registration form using the subscriber's personal information. After it is completed, your SIM card will have the subscriber's information stored and is ready for use.
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