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A SIM card, often known as a subscriber identity module, is a smart card that stores identification information that pinpoints a smartphone to a specific mobile network. Data that Sims contain include user identity, location and call number, network authorization data, personal security keys, contact lists and stored sms. SIM cards allow a mobile user to work with this data along with the features that are included with them.

Without a SIM card, some phones couldn’t survive capable of making calls, connect with internet services including 4G LTE or send SMS messages. SIM cards are removable and also have between, 32KB to 128KB.

Not every phones with Sims work the same, however. There’s two distinct technologies used; GSM (Global System for Mobile communication) and CDMA (Code Division Multiple Access). GSM is easily the most widely adopted technology digital mobile network. Network carriers for example AT&T and T-Mobile use GSM. If the carrier uses GSM, which means that users can remove their SIM card from the unit and move it to another mobile device with all the same data and contacts on it. The network carrier is still able to identify the user.

CDMA enabled phones don’t require a Sim; instead, the mobile device uses a digital serial number (ESN). Users that have a mobile phone having an ESN cannot switch between devices as easily as users would want permission using their network carrier. Network carriers including Sprint and Verizon use CDMA.

Despite the fact that carriers for example Sprint and Verizon do not require SIM cards, Sims are can nonetheless be seen in devices under those networks. This is because cellular devices need the usage of SIM cards to work with 4G LTE.

A tool called a Sim reader may be used to upload data from the Sim into a computer or another device.

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