BELLEVUE, WASH. —

T-Mobile announced April availability of its previously announced LG-made G2x and Samsung-made Sidekick smartphones.

Both are Android 2.2 smartphones equipped with 4G HSPA+ service.

Both models will be in stores April 20. The G2x —formally called the T-Mobile G2x with Google by LG — will also became available through the carrier’s website on April 15.

The carrier also disclosed a G2x price of $199 with two-year service contract.

For its part, the Sidekick will retail for $99.99 with an unlimited-data plan and $149 with other data plans.

The G2x, unveiled at the recent CTIA convention, is a version of the previously announced 1GHz dualcore LG Optimus 2X, billed as the world’s first phone to capture, store and play back video in full 1080p/24 fps resolution. The G2x features what the carrier calls a “Google experience” and comes with 4-inch 400 by 800 capacitive touchscreen, 8-megapixel camera, front-facing 1.3-megapixel camera, and HDMI mirroring.

The Sidekick 4G, like its Sidekick predecessors, is designed particularly for messaging and web browsing, but for the first time, a Sidekick phone gets the Android OS and a touchscreen, which faces up like a typical smartphone’s touchscreen to enable users to dial and access apps. The touchscreen pops up at an angle via a pop-tilt hinge to reveal a five-row QWERTY keyboard.

Other new features include 1GHz processor, a frontfacing camera, and pre-installed video chat capability.