How To Activate Your Sim Card T Mobile. Tmobile sent me a new sim. Your phones serial number sometimes referred to as IMEI.

Select confirm or change your device. Go to Device Support. Its really easy and quick to activate your new Three Mobile SIM card.
Your phones serial number sometimes referred to as IMEI.
Gather the items youll need to activate service. Use this on your unlocked compatible device to access the T-Mobile network. To start visit the Activate your new SIM page. Select confirm or change your device.
