Hardware
The ChaCha - which is also known as HTC ChaChaCha in some areas, where "chacha" has meaning less safe - is one of the most distinctive combination of HTC when it comes to design. QWERTY Android phones are still a minority, despite the popularity of messaging-centric devices like the BlackBerry, those we see tend to include a slide-out keyboard, rather than using a one-piece form factor.
Thus, the chacha gives you 2.6-inch Touch Screen 480 x 320 resolution above a full QWERTY thumbboard, with a row of the usual touch function buttons Android - home, menu, back and research - and dedicated call / end keys sandwiched between the two. On the left side there is a volume rocker and a microUSB port, but unlike the salsa there is no dedicated camera shortcut on the right. The power button / lock and headphone jack are on the top edge.