"It's official, T-Mobile's Sidekick 4G arrives on April 20," T-Mobile tweeted this morning. The G2x, meanwhile, will be available online on April 15 and in stores on April 20, T-Mobile also tweeted. It will sell for $199.99 after a $50 mail-in rebate and two-year contract.
T-Mobile confirmed plans for the Samsung Sidekick 4G back in January, and provided more details last month. It features a 3.5-inch, 800-by-480 screen and is based on a heavily customized Android 2.2.1 and Samsung's TouchWiz. The screen slides up with a click to reveal the 5-row QWERTY keyboard.