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Want to trade in your old iPhone? T-Mobile will match other carriers and add $50 extra

It’s raining smartphones! The Samsung Galaxy Note 4, Note 4 Edge, Sony Xperia Z3, and a slew of other smartphones just launched at IFA and now Apple is set to launch the iPhone 6 at a September 9 event in San Francisco. With all these new devices flooding the market, many users are considering trading in their old smartphones. In response, T-Mobile is offering a new trade-in promotion.

If you find out that Verizon, AT&T, or Sprint will offer you more for your old smartphone, the Uncarrier will not only match that trade-in value, but also give you an extra $50. Of course, this only applies to trade-in values from other carriers, so if you find a better deal on eBay, Gazelle, or the Apple Store, you’d best go with that instead.

Related: Top 10 things we know about the iPhone 6 right now

The offer begins on September 17, which is, coincidentally, the day after many expect Apple to start selling the iPhone 6 in stores, and will only be available for a limited time. The offer applies to all smartphone models, including the iPhone and Samsung’s smartphones.

Customers who want to take advantage of the promotion just have to call T-Mobile or visit the company’s website within seven days after they’ve traded their old smartphone in at a T-Mobile store and say where, when, and how much more another carrier will pay for their old smartphone. Once the information has been verified, T-Mobile will send customers the price difference plus $50 as a credit on their bill within 2-3 billing cycles.