If you’re shopping for a couple of new phones, you’ll be interested to learn that T-Mobile has recently announced that they will be running a promotion in which customers who purchase an iPhone 7, 8, or X will be able to get another iPhone for free, or up to $700 in rebate, depending on the phone that they have chosen.

So how does this work? Basically customers choose from one of T-Mobile’s eligible phones, and then they’ll have to port in their numbers, trade in an eligible phone, and complete the online rebate form. Note that essentially you’ll have to purchase two devices at once, and your rebate won’t come in the form of monthly credit on your bill, but rather it will come in the form of a prepaid MasterCard that will arrive 6-8 weeks after your trade-in has been received.

Note that the rebate is up to $700, which means that depending on the device that you have chosen, it could essentially be free, or for more expensive models like the iPhone X, it would basically be a rather hefty discount. Whether or not you think that this deal is worth it is up to you, but for more information or to start the process of signing up for it, you can head on over to T-Mobile’s website.

It should also be pointed out that T-Mobile’s BOGO deal isn’t limited to just the iPhones and will also be available to phones from the likes of Samsung and LG, just to name a few.

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