T-Mobile has just revealed on Twitter that the hotly anticipated HTC One will launch on its network on April 24th, and asTmonews reports, the handset is expected to feature Wi-Fi calling. The One joins T-Mobile's expanded portfolio of LTE phones, including the iPhone 5, the Galaxy S4, and the BlackBerry Z10, which the company announced at a wild event back in March. The One will be offered for just $99 up front, and is available on T-Mobile's new contract-free plans, including a $70 per month plan that provides unlimited voice, texts, and data.