Oh, dang. That’s what the collective voices of T-Mobile, Sprint, Verizon and other carriers’ customers will say after reading this. HTC today announced the beefed up version of the One X – the One X+ – and now AT&T has announced that they will be the exclusive carrier of the device in the US.

It was earlier rumored that the One X+ would be coming to T-Mobile, but that won’t be the case anymore and will disappoint a lot of customers, as the device is quite a good upgrade over the One X, with a 1.7GHz Tegra 3 processor that can provide up to a 67% performance boost over the One X, Android 4.1 with the latest Sense skin on top, a larger 2100 mAh battery that allows up to 50% more talktime, an upgraded front camera, and higher internal storage at 64GB.

Another exclusive device that has been announced is the HTC One VX, a mid-range device that sports a 1.2GHz dual-core Snapdragon S4 processor (MSM8930), 4.5-inch Super LCD2 display (540×960), 8GB internal storage, 5 megapixel camera, 1810 mAh battery, Android 4.0 (update to Android 4.1 to come later), and support for AT&T’s 4G LTE network.

No info on the release date and pricing has yet been released for either devices but should be announced soon. It’s quite a bummer for users of carriers other than AT&T, but seeing as how good a device the HTC One X+ is, I think I see a mass exodus of customers to AT&T’s network already.