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What Is A SIM Card?

Sunday, April 19th, 2015 by | Filed Under: Quick Tips, Smartphones

Al from Wisconsin asks,

What is a SIM? My cellphone provider has asked me to register my SIM? I don’t know what this is?

Hi Al,

The SIM card is the Subscriber Identity Module. This is a small card that is mostly found in cell phone that operates on the Global System for Mobile Communications (GSM) network.


This small card stores your profile and details about your subscribed services and features, such as your phone number, address book, and other data, as well as your data and voice plans. It also allows you to access your provider’s services. It must be activated to be used with your carrier, which is why they are asking you to register your SIM.

One of the benefits of these cards is that if you want to switch phones, you can usually remove the card from one headset and insert it in another, allowing you to keep all this information. It also offers security, as they can be locked with a PIN to prevent anyone without the PIN to access the information.

~ Audra

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2 Responses to “What Is A SIM Card?”

  1. Chauncey R. Black says:

    What data from the SIM should Al look for? Where it is located? How does he go about registering this data, once found?

  2. Jadesqr says:

    Hey Audra,
    It may be worthwhile to note that other uses for SIM cards exist including ‘Bank Cards’ where due diligence in content and disposal should be discussed.

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