T-Mobile has been successful with its first Android-powered mobile phone the G1. The phone has sold very well and T-Mobile is now set to begin selling its second Android-powered phone to its existing customers.

The T-Mobile myTouch 3G is available for pre-order to existing customers. Customers that order the phone through July 28 can get the myTouch 3G delivered before the national retail launch on August 5. The myTouch 3G will replace the G1 as T-Mobile’s premier Android device.

T-Mobile will offer a variety of accessories for the myTouch 3G to allow customers to customize the phone on the outside and inside including widgets, icons, and wallpapers. T-Mobile will also be launching an AppPack for the device in August that will highlight a variety of applications to help users personalize the phone. The phone will retail for $199.99.

[via T-Mobile]