T-Mobile: How to activate a new SIM card
Here's a step-by-step guide on activating your T-Mobile SIM card and connecting to the T-Mobile network. A brief company ...
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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 ... This is the modern way of activating a SIM card on a new device, and it will likely replace physical SIM cards.