Three is offering the handset for free when you sign up to a One Plan contract at £29 per month.
That entitles you to unlimited data every month, 2,000 any network minutes, 5,000 Three-to-Three minutes and 5,000 texts.
The handset’s key USP is tight Facebook integration, with a dedicated button that makes it easier and faster to share snaps and whathaveyou.
But it’s no slouch elsewhere either, packing the latest smartphone version of Android, AKA Gingerbread, out of the box and a QWERTY keyboard for tapping out Facebook updates and emails in a trice.
It’s also home a five-megapixel snapper, a 2.6-inch touchscreen and a front-facing secondary camera for video calling.
Sylvia Chind, HTC head of devices said: “Facebook on Three receives over 38 million page views every day. It’s because of this popularity that we’re delighted to be stocking the HTC ChaCha.
“Not only will our customers be able to access their favourite Facebook features at the touch of a button, but coupled with Three’s all-you-can-eat data they can surf their favourite site without having to worry about going over any internet allowances.”