Some might consider holding a grudge while your company is struggling to stage a comeback ill-advised, but BlackBerry took it personally when T-Mobile recently had some fun at its expense. For those who don’t recall, T-Mobile recently offered subscribers a promotion where they would get extra money when trading in their BlackBerry smartphones towards the purchase of a new iPhone. BlackBerry CEO John Chen wasn’t shy in voicing his anger, and T-Mobile responded by rethinking its promotion. As it turns out, the changes didn’t matter and BlackBerry customers still abandoned the platform en masse in favor of Android and the iPhone. Now, BlackBerry-has decided to send T-Mobile a different kind of breakup letter. The Waterloo, Ontario-based smartphone maker on Tuesday



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