If HTC is able to make enough HD2‘s for T-Mobile to sell, you might be able to trade in your old iPhone for one. From April 1 through May 19th, an Apple iPhone trade-in can get you up to a $350 credit when purchasing an HTC HD2 through 1-800-TMOBILE, participating T-Mobile Dealers, or Business Direct Sales Representatives. Unfortunately, all of the T-Mobile HD2′s have been sold right now, so call your local T-Mobile stores and ask when they’ll have more first.

(via TMoNews)