A Subscriber Identity Module, commonly known as a SIM card, is a small programmed microchip that mobile phone carriers assign to cellular phones to identify a user in a mobile network. A SIM enables you to use your mobile device by encrypting transmissions, and it also works as a removable storage device where you can store pictures, videos and songs, as well as other files from your cellular phone. Having a phone recognize a SIM card is simple; however, you must ensure that it is inserted correctly so your device can read it and connect to the network. Tips Warnings Writer Bio
