T-Mobile has just announced their new “Un-carrier + BlackBerry = One Sweet Deal” promotion where customers can bring in their used BlackBerry handset and trade it in for a newer device, with T-Mobile giving them $200 in credit towards the new device. But wait, what’s in it for BlackBerry users? Well for BlackBerry users who wish to remain with the platform but could use a new device anyway, T-Mobile will be offering an additional $50 off the purchase price of a new BlackBerry (either the Z10 or the Q10), essentially offering BlackBerry customers up to $250 in credit towards a new phone. Of course needless to say that the phones must be in working condition, no cracked screens or have signs of water damage. We’re not sure if this is a great deal but hey, if you’re looking for a new phone, why not, right?