T-Mobile USA has officially announced its new high-performance T-Mobile G2 Google smartphone (the successor to highly-popular T-Mobile G1), which the company claims as the first smartphone that is created to deliver extreme-fast 4G speeds on T-Mobile’s new HSPA+ network. The T-Mobile G2 Android 2.2-powered smartphone features a 800MHz Snapdragon MSM7230 processor, large 3.7-inch capacitive touch screen, slide-out full QWERTY keyboard, 5-megapixel autofocus camera with LED flash and 720p HD movie capture, Swype technology, Voice Actions from Google and 4GB on-board memory, pre-loaded with an array of well-known Google services to enrich your multimedia experience.

For added convenient, T-Mobile G2 with Google also is equipped with a Dedicated Quick Keys that allows for quick, one-touch access to your favorite Google apps.

T-Mobile G2 delivers a powerful mobile data experience that is tightly integrated with Google Voice, as well as packed with Google applications such as Voice Actions from Google, Google Goggles and more. It is one of the first smartphones in the industry to offer the new Voice Actions feature of Google Search, which allows you to control your phone with your voice for calling contacts and businesses, sending messages, browsing the Web, listening to music and completing common tasks. It is also the first smartphone to offer integrated access to Google Voice, allowing customers to create a new account using their current mobile number right from the home screen. Google Voice then automatically transcribes voicemails to text so customers can read them like an e-mail or text message from their phone or online.

The new powerful T-Mobile G2 with Google smartphone that comes along with a free 8GB microSD memory card is expected to be available exclusively for T-Mobile customers by October 2010.

Update: T-Mobile G2 will hit Best Buy stores in coming October 6 for $199.99, with new two-year service agreement.