British network O2 is now offering HTC's new Facebook phones, the


, on-contract and on Pay & Go. The ChaCha can be yours for £209.99 with a PAYG SIM, or for free on contract a number of 18 and 24-month contracts. Free contracts start at £21.50 for 24 months, or £26.50 for 18 months. If you go for a cheaper contract, you'll pay £60 up-front for your ChaCha.

The Salsa will set you back a little more. On Pay & Go, it'll cost you £299.99, and on-contract subsidized prices are a bit higher too. On a 24-month contract, £27 per month will be enough to get you a free Salsa, while the cheapest 18-month contract with a free phone costs £37 per month. Cheaper contracts are available, and you'll pay up to £105 for the phone if you choose one of these.

Hit the source links to view the complete list of O2 tariffs for each phone.

HTC Salsa on O2

HTC ChaCha on O2