ANSWERS: 1
  • Your cell phone needs a few things to work properly--namely power and reception. But if your phone is from Cingluar--or as its now known, AT&T--you will also need a SIM card to connect your phone to your mobile network.

    Importance

    All Cingular cell phones require a SIM card to connect to its mobile network. If you haven't inserted your SIM card your phone will power on, but it will not work to make calls or send text messages and the error message will appear.

    What is a SIM card?

    A SIM card is a small storage device that fits into cell phones--similar to the memory card for a digital camera.

    Function

    On mobile networks that require a SIM card--including Cingular--the card essentially serves as a mini hard drive for the phone. It contains contact information, text messages, caller ID information and other data. Without this card, your Cingular phone will not work for anything other than 911 calls.

    Benefits

    Because all of your customer data--including contacts and phone number--is tied to your SIM card, you can switch it do different cell Cingular cell phones without losing your important data.

    Appearance

    A Cingular SIM card is a small chip, with the Cingular logo and serial number on the front of it. On most Cingular phones the SIM card is found in the back of the phone, behind the battery.

    Source:

    AT&T Answer Center: What is a SIM Card?

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