![]() ![]() GSM is the most widely adopted technology digital mobile network. ![]() There are two distinct technologies used GSM (Global System for Mobile communication) and CDMA (Code Division Multiple Access). Not all phones with SIM cards work the same, however. SIM cards are removable and have anywhere from 32 KB to 128 KB. Without a SIM card, some phones would not be able to make calls, connect to internet services such as 4G LTE and 5G or send SMS messages. SIM cards allow a mobile user to use this data and the features that come with them. Gillis, Technical Writer and EditorĪ SIM card, also known as a subscriber identity module, is a smart card that stores identification information that pinpoints a smartphone to a specific mobile network.ĭata that SIM cards contain include user identity, location and phone number, network authorization data, personal security keys, contact lists and stored text messages. ![]()
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