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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.
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Metro by T-Mobile: How to activate your SIM cardThis guide shows you how to activate a physical SIM card or eSIM on your Metro by T-Mobile device. A physical SIM has been the traditional form of SIM card used since the first mobile wireless ...
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