O2 has launched the pair of high-end Android phones on Wednesday, April 5th.
Actually, it wasn't just O2, other carriers like Vodafone, Orange, T-Moble, and Three also joined in.
Depending on the carrier and which plan you use, the HTC One X ad the HTC One S can be had for free.
A Sim-free, carrier agnostic unlocked version of either phone is available via Amazon. The HTC One X is priced at £489.99 ($780 USD) via Amazon and the HTC One S is £414.99 ($660 USD) from the online retailer.