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A SIM card, also called a subscriber identity module, is a smart card that stores identification information that pinpoints a smartphone to some specific mobile network. Data that Sims contain include user identity, location and phone number, network authorization data, personal security keys, contact lists and stored texting. SIM cards allow a mobile user to use this data along with the features that come with them.
Without having a SIM card, some phones would not be able to make calls, connect with internet services such as 4G LTE or send SMS messages. SIM cards are removable and still have anywhere from, 32KB to 128KB.
Its not all phones with Sims work the same, however. There are two distinct technologies used; GSM (Global System for Mobile communication) and CDMA (Code Division Multiple Access). GSM is the most widely adopted technology digital mobile network. Network carriers like AT&T and T-Mobile use GSM. In case a carrier uses GSM, this means that users can remove their Sim coming from a unit and move it to another cell phone with all the same data and contacts onto it. The network carrier will still be in a position to know the user.
CDMA enabled phones do not need a Sim; instead, the mobile device uses an electronic serial number (ESN). Users that have a cell phone with an ESN cannot switch between devices just as easily as users would require permission using their network carrier. Network carriers such as Sprint and Verizon use CDMA.
Though carriers like Sprint and Verizon do not require SIM cards, SIM cards are may still be present in devices under those networks. This is because mobile phones require usage of Sims to work with 4G LTE.
A computer termed as a SIM card reader can be used to upload data from your SIM card to some computer or other device.
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