How Do I Register My Sim Card On My Phone. Use this on your unlocked compatible device to access the T-Mobile network. When you switch on your phone.

Make sure to use the SIM card that came with your new device or order a new one. We ship most new devices with the SIM card inserted in your device and activated. Otherwise talk to your service provider about a replacement.
Use this on your unlocked compatible device to access the T-Mobile network.
If youre unable to activate the card online you can give ATT a call from a working phone. Get your phone and SIM card ready. Enjoy all the benefits of our unlimited plans. Youll also need your Metro SIM card.

