T-Mobile on Monday announced a new guarantee for prospective customers looking to trade in their old devices. According to the Un-carrier, they will offer the best trade-in value for used devices. So confident are they that they’ll give you $50 if you find a better deal elsewhere.

When that new superphone’s price is the same everywhere you go, the difference in your final cost comes down to the trade-in value of your old phone,” said Mike Sievert, chief marketing officer for T-Mobile.  “Now when you’re ready to upgrade – it’s a no brainer where to find the best value– the Un-carrier. Guaranteed.

How does it work? Easy, you trade in your old phone or tablet and get your credit from T-Mobile. If you find something better from another wireless provider in the next seven days you can call T-Mobile or visit their website to tell them what you found and where. If it’s lower, T-Mobile will give refund the difference and give you a $50 credit. The money is applied as a bill credit within 2-3 bill cycles.

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This guarantee, unfortunately, is only for a limited time. Set to take effect on September 17, it’s not immediately clear how long it will last.

T-Mobile

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