Activate your SIM card online or in person.
Before you begin using your AT&T cell phone, you must activate the SIM card, which contains all your personal information. AT&T offers multiple ways to activate your phone. The company also allows users who make multiple phone purchases, such as a parent buying lines for an entire family, to activate all numbers and SIM cards at one time.
Instructions
1. Place the AT&T SIM card into the appropriate slot on your phone. On most cell phones, you have to remove the back of the phone and slide the SIM card into a slot beside the battery. After the card is in position, replace the back and turn on the phone.
2. Visit the AT&T "Activate Your Phone" page (see Resources). Answer some basic questions, including whether the phone is a new line or a new phone. You also have the option of activating the "Pay as You Go" phones, which don't require a contract.
3. Take your phone to an AT&T store, if you can't access the website or prefer to activate your SIM card in person. A representative from the company will ask you a few questions and use that information to access your account. Then she will activate the SIM card automatically, though you may need to pay a small fee.
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