T-Mobile: How to activate a new SIM card
These steps show you how to do it: Power down your phone and then insert the new SIM card ... for this You may find it easier ...
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Metro by T-Mobile: How to activate your SIM card
As a new customer, you must pick a phone plan and set up your Metro by T-Mobile account. After you complete that and receive your phone and SIM card, use the activation website to activate your ...