T-Mobile has had a Buy One, Get One free (BOGO) deal for the Samsung Galaxy S7 and S7 edge back in March, yet now it's relaunching it while also making it bigger than ever. See, from today onwards you can do the BOGO thing for every single Samsung smartphone that T-Mobile is currently offering.
The first smartphone has to be grabbed using an installment plan, while the second one can use that method or you can pay the full price for it. You'll have to add at least one new line and maintain service on that line for at least three months.
Once you've purchased the two devices, go to this page within 30 days and fill out the form using the promo code SAMSUNGBOGOMAY16. And from that point on you should receive a prepaid MasterCard containing the rebate for your second handset within eight weeks. Keep in mind however that if you choose two different models, the cheaper one will be the one that becomes free after the rebate.
If you grab the Galaxy S6, S6 edge, S6 edge+, or Note 5 before June 14, you can also qualify to receive a $150 rebate from Samsung, which you can claim on this page. It will take about 4-6 weeks for this rebate to make it to you after your claim is verified.