What is SIM Card? What Does it do in the Mobile
The SIM card is otherwise known as the Subscriber Identity Module and is used on smartphones worldwide. It is a smart card that stores GSM mobile subscriber data. GSM stands for Global System for Mobile communication and is a widely used digital mobile network in Europe, Asia, Africa, and around the world. The U.S. is unique and uses both GSM and CDMA (Code Division Multiple Access). Phones in the GSM network can use the company network, reducing the cost of network operators and their users. Europe approved the use of GSM in 1987 and the phones and equipment of these…