This weekend T-Mobile is offering S7 buy one get one limited Free deal. You can avail a free Samsung Galaxy S7 when you get one with an Equipment Installment Plan.

Customers can choose to take advantage of the deal in a retail store, online, or over the phone.
You'll need to pick up the first Galaxy S7 with an installment plan, The second Galaxy S7 will be free with bill credits for 24 months of the contract. If you cancel service before those 24 months are up, the remaining balance on the phone will be owed.

According to Android and Me, The second Galaxy S7 has to be purchased and activated on a certifying line of service, old customers (with Simple Choice Unlimited plan)Simple Choice Unlimited or T-Mobile ONE line is must have with the second device to be eligible. Old customers (with a plan other than Simple Choice Unlimited or T-Mobile ONE)T-Mobile ONE plan must have with the first device and a second device to be eligible. However, For new customers: Must require to port-in a line and activate both devices with T-Mobile ONE service to be qualified.

Mentioned from Android Authority, I say "sort of free" because the price of the second handset is eventually returned through 24 months worth of call credits with a qualifying line, as is normally the way with these deals. As a bit of an added bonus, T-Mobile says that customers from other carriers can use this limited deal in conduction with its "Carrier Freedom" promotion. This seems T-Mobile will cover the expense of you, switching carrier up to a value of $650 per line via trade-in credit and a prepaid Mastercard.

The Galaxy S7 may not be the newest Android phone on the market, however, it's still one of the best Android phones available. A 5.1-inch 2560×1440 AMOLED display, powered by Snapdragon 820 processor, 4GB of RAM, 12-megapixel camera, and a microSD slot. Moreover, the GS7 will be updated to Android 7.0 Nougat.