T-Mobile rustled BlackBerry fans feathers when the company sent out promotional emails trying to sway users to the Apple iPhone 5S. This led to some back-and-forth between BlackBerry CEO, John Chen, and T-Mobile CEO, John Legere.

Eventually, T-Mobile decided to create a trade-in promotion that gave customers $200 towards any device of their choosing, with an additional $50 if the trade-in device were a BlackBerry.

According to a tweet by T-Mobile CMO Mike Sievert, the company has revealed they’ve seen 15 times more BlackBerry trade-ins than usual over the last two weeks. The offer for this promotion ends this Wednesday.