T-Mobile: How to activate a new SIM card
If you purchased your device from T-Mobile, the SIM card is probably installed. If not, you must provide your phone's IMEI ...
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Metro by T-Mobile: How to activate your SIM card
If you have one of the compatible Metro by T-Mobile Android phones, activating a SIM card is easy. You can use several methods, such as activating it online or having a customer service ...