Important Information About Sim Card

· 2 min read
Important Information About Sim Card




A SIM card, also known as a subscriber identity module, is a wise card that stores identification information that pinpoints a smartphone to a specific mobile network. Data that Sims contain include user identity, location and make contact with number, network authorization data, personal security keys, contact lists and stored texting. SIM cards allow a mobile user to use this data and the features that come with them.




With out a SIM card, some phones would not be capable of making calls, connect with internet services including 4G LTE or send SMS messages. SIM cards are removable and have between, 32KB to 128KB.

Not all phones with Sims work the same, however. There are 2 distinct technologies used; GSM (Global System for Mobile communication) and CDMA (Code Division Multiple Access). GSM is regarded as the widely adopted technology digital mobile network. Network carriers such as AT&T and T-Mobile use GSM. If your carrier uses GSM, because of this users can remove their Sim from a device and move it to another cell phone with all the current same data and contacts about it. The network carrier will still be able to find out the user.

CDMA enabled phones don't require a SIM card; instead, the smart phone uses a digital serial number (ESN). Users that have a cell phone having an ESN cannot switch between devices as quickly as users would wish permission using their network carrier. Network carriers for example Sprint and Verizon use CDMA.

Though carriers including Sprint and Verizon don't need Sims, Sims are can nevertheless be present in devices under those networks. It is because cellular devices have to have the utilization of SIM cards to utilize 4G LTE.

A tool referred to as a Sim reader enable you to upload data from the Sim with a computer or other device.


More info about sim so dep viettel you can check this webpage: read more