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.

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 ...

Purchase a new T-Mobile SIM card. You can purchase a SIM card online at T-Mobile.com, by calling T-Mobile at 800-866-2453 or at any T-Mobile retail store.