Q:

What is a SIM card?

A:

Quick Answer

As of 2015, a SIM card is used by a GSM cell phone to connect to a subscribed mobile network. The average SIM card is made up of two components, which are the Subscriber Identity Module and the plastic encasement that surrounds it.

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What is a SIM card?
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Full Answer

Inside the SIM card is unique data that allows a mobile network to identify a phone. The SIM card gives the network access to communication features, such as phone calls and SMS messaging. A SIM card also contains a small-sized memory space, which allows it to save up to 250 unique contacts as well as other types of information. SIM cards are interchangeable between different compatible handsets.

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