Help me unlock my iPhone X
IMEI:356721086515500
You need to be a customer of Tmobile USA and meet all the requirements in the link below.
https://www.t-mobile.com/support/devices/unlock-your-mobile-wireless-device
If you aren't a customer, Tmobile won't be able to help.
Enter your username or e-mail address. We'll send you an e-mail with instructions to reset your password.