T-Mobile takes $100 off the price of iPhone 7 256 GB, offers free iPhone SE (in certain conditions)
The conditions of the deal/s may have changed since the initial publishing of this post.
For a limited time, T-Mobile lets you buy an iPhone 7 256 GB for the price of a 128 GB model. More exactly, instead of paying $849.99 for the iPhone 7 256 GB, you'll only pay $749.99 (or $125.99 upfront, and $26.00 per month for 24 months) - this means you'll be saving $100. Unfortunately, the offer only includes the 4.7-inch iPhone 7, so it excludes the larger iPhone 7 Plus.
sources: T-Mobile, Twitter
Things that are NOT allowed: