Switching to the Un-Carrier can be exciting, but you have to know how to get set up. Here's how to activate a T-Mobile SIM card.

May 1: Customers without a T-Mobile SIM will lose service. If you are still using a Sprint SIM card on a device that is compatible with T-Mobile’s network, the carrier will swap your SIM for free.

T-Mobile's self-service SIM managing tool is back in the T-Life app. Here's how to get it set up and transfer your own SIM cards and eSIMs on your own.

T-Mobile is bolstering SIM card security to prevent unauthorized attacks, meaning more steps will be required for customers to swap SIM cards.

What's True SIM swap fraud, in which a cellular service provider is duped into assigning a mobile phone number to a new SIM card is real and on the increase, according to experts.

To avoid even the slightest threat of telephone fraud or SIM swapping attacks, the Italian telco is now offering to replace SIM cards for all impacted customers, if they wish, and free of any charges.