AT&T is already gearing up for the release of the HTC One M9 and the Samsung Galaxy S6. We know the latest Samsung Android flagship phone will arrive in the United States this coming April 11. The unit was also listed for pre-order in the UK last week. On the other hand, the HTC One M9 is expected to arrive a day earlier on April 10. We already know that T-Mobile is offering the One M9 but good to know another mobile network is carrying it soon.