T Mobile Activate Old Phone. And if youre an Apple fan you can trade in your non-5G iPhone for a new iPhone 12. Up to 6 cash back Activating a new phone smartwatch or tablet on ATT is easy.

And if youre an Apple fan you can trade in your non-5G iPhone for a new iPhone 12. To ensure proper activation of your phone you must use the smart card from your old phone. 25month for 1-line of unlimited smartphone data tethering not included limited tethering included with Boost 50 plan.
Current T-Mobile customers upgrading to a new device.
Before the iPhone can be used it must first be activated and configured to work on the T-Mobile network. If youre unable to complete the activation online you can. Simply follow the steps on your screen to complete activation and set up. That time I activated a prepaid plan for using during my visit.
