T-Mobile currently focuses on "On Us" offers rather than traditional BOGO branding, though the net result is similar for multi-line accounts.
Get two Apple iPhone 17e devices for $0 via 24 monthly bill credits when switching and adding two lines on the Essentials promo plan. iPhone 17 "On Us": t mobile buy 1 get 1 free iphone
New customers can get an Apple iPhone 17 (up to $830 value) for free with a new line on the Experience Beyond plan. T-Mobile currently focuses on "On Us" offers rather