https://www.cnet.com/news/cyber-monday-2018-iphone-sales-now-free-iphone-xr-49-iphone-6s-apple-watch-series-4-discounts/

T-Mobile is extending a different kind of gift to phone owners. When you activate a new account with a voice line and add a line of data, you can choose from one of these gadgets:

The discount comes in the form of 24 months of monthly bill credits.