This procedure will force activate iPhone. If it is after the official unlock from the operator T-Mobile USA, when you activate a new status through iTunes prompts you to specify the ZIP code (Billing Zip code and Last 4 SSN (Last 4 digits of Social Security Number).
ATTENTION! VERY IMPORTANT:
-
Unlock new models SE/7/7+/8/8+/X is more expensive. Look price in the drop-down selection list of models.
-
Before ordering this service yuor phone must be unlocked.
-
If you order not unlocked IMEI, cancelation is IMPOSSIBLE! You lose money for such an order!
-
Check the UNLOCK status before ordering!
-
Before ordering necessarily need to order check by IMEI.
-
Before ordering services necessarily need to upgrade your phone to the latest version of iOS!
In the picture you can see where to get the part number for order this procedure!

Also, this service helps to activate unlocked phones from T-mobile with the following problem:
Apparently, the SIM card inserted into this iPhone is not supported.
This service is intended for the forced activation of such phones.