- 1). Press and hold the phone's "Off" button until the device powers off. Turn the phone over and grip the raised grooves on the battery cover. Slide the cover off the phone.
- 2). Pull the battery out of the phone to find the SIM card compartment. Lift off the small metal tab holding the rectangular SIM card in place. Pull the SIM card out of the phone and note down the serial number on the back of the card.
- 3). Replace the SIM card and battery and push the battery cover back into place. Turn on the phone. Access the AT&T SIM card activation Web page on your computer.
- 4). Click the "New customer or add a line" radio box if you are using a standard phone, or choose "Pay as You Go" if you are using a pre-paid phone. Type your full number, including the area code, in the "Wireless Number" text box.
- 5). Click "Verification Number" and choose the method you want to use, such as "ZIP Code" or "Last Four Digits of Social Security." Type your verification number in the next text box and click "Next."
- 6). Continue typing your personal information in the next text boxes, such as your name and address. Enter the SIM card serial number in the corresponding box and click "Finish" to activate the card.
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