The explained steps in this Guide will help you to Factory Reset Samsung Galaxy J7 Prime with model number SM-J727T from T-Mobile USA, And it comes with model number SM-J727T1 for MetroPCS USA.
There are two factory reset methods, The first one (Factory Reset Samsung Galaxy J7 Prime from Settings Menu) you can use it when your Galaxy device is powered on, When the second one (Factory Reset Samsung Galaxy J7 Prime from Recovery Menu) is used when your phone is Powered off.
You want to use your Samsung Galaxy J7 Prime during your vacation or business trip outside the USA. But you can not because it is SIM Locked to T-Mobile Carrier.
No problem you can use it with any SIM card worldwide if you Unlock it, And this guide will show you how to SIM unlock your Galaxy J7 Prime using the T-Mobile Device Unlock application.