If you’re going to get a new iPhone, I highly recommend doing it at the Apple Store. Unless there is an amazing deal without any catches at T-Mobile, Apple is a far, far better choice. The Specialists at Apple will help you through the buying, activation, and setup process and won’t try to upswell you anything because that’s just not Apple’s model. Even something like hardware coverage for your device will cost less at Apple. T-Mobile stores are parasites that upsell everything they can and charge more for the same hardware and services. I used to be a T-Mobile customer but never again.