T-Mobile is currently offering the HTC HD7 Windows Phone smartphone for free after new agreement until Thursday as an online-only promotion, going as far as undercutting Amazon by $100. For those that need a refresher on the HTC HD7, the phone features a 4.3-inch display, 1GHz Snapdragon processor, Wi-Fi radio, Bluetooth, GPS, 5.0 megapixel autofocus camera with 720p video capture and 16GB of internal storage.