A Subscriber Information Module (SIM) stores subscriber information for GSM netowrks and makes it very easy to switch phones
Cellular phones that follow the Global System for Mobile Communication (GSM) standard can be either locked or unlocked. A locked cell phone is tied to a specific network and will not work with a Subscriber Information Module (SIM) card from a different network provider. Unlocked cell phones, on the other hand, will work with a SIM card from any cellular provider. Unlocked cell phones are more common in Europe and Asia. Most American GSM carriers, however, sell primarily cell phones tied to their native networks. If you have bought an unlocked cell phone, either from a carrier or a third-party supplier, setting up the unlocked cell phone is very easy.
Instructions
1. Install the SIM in the phone. On most phones, the SIM is located under the battery. To access the SIM slot, you will need to remove the battery cover and the battery. However, some modern phones have a SIM slot elsewhere on the phone, such as the side or the top. This is to make switching SIMs more convenient.
2. Put the battery back in the phone, if your SIM slot was under the battery.
3. Place the cover back on the phone.
4. Plug the phone in to charge the battery, if it has not been charged.
5. Power the phone on. The SIM card will configure your phone's cellular and data network connections to suit the carrier's requirements.
Tags: cell phones, back phone, card from, cell phone, Information Module, provider Unlocked