AT&T allows users to block caller ID on a per-call basis through the menu on their handset. The instructions vary depending on what make and model of handset the user has. GoPhone is AT&T's prepaid wireless service. Users can also block caller ID permanently on all calls, or block their names and allow their numbers to go through.
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Open your web browser and go to the AT&T Phone & Device Support page. You can find the link in the Resources section.
Ignore the first drop-down box, since it doesn't apply to GoPhones. Click the second drop-down box to select the manufacturer of the phone. Click the third drop-down box to select the model. Click "Next" to display the support menu for your phone.
Click the "+" next to "Calling Features" in the left-hand menu bar and click "Caller ID" to display detailed instructions for your GoPhone.
Follow the instructions to block your number.