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You can activate your AT&T SIM in-store, online, or by contacting customer service. The process is similar for postpaid and AT&T prepaid customers.

If you've resolved to save money this year, finding the best prepaid phone plan can help you reach ... And even though they're big name carriers, Verizon and AT&T have options that I can recommend ...

AT&T Prepaid is giving away free and discounted phones for tax season. Visit any store before April 17 to grab these deals.