The process to activate a T-Mobile prepaid SIM card is nearly identical to regular T-Mobile SIM cards. Just put it in your device, and call 1-800-937-8997. Activate the SIM online ...

If you're a new T-Mobile customer or you recently purchased a new phone, you may have a new SIM card you'll need to activate. Here's how to set it up.

T-Mobile subscribers are facing issues with SIM activation due to a widespread outage. Users are unable to make calls, send texts, or connect to the internet after activating a new physical or ...

T-Mobile is bolstering SIM card security to prevent unauthorized attacks, meaning more steps will be required for customers to swap SIM cards. The new "Account Change Engine" by T-Mobile vets SIM ...

Contact T-Mobile Customer Service: You can use your phone, and SIM card to change your number from your T-Mobile phone, by dialling 611 or 1-877-746-0909 and follow the instructions. There is a $15 ...