You can pick up both the phones on the network either online or in store, ranging from free to £99 depending on your contract.
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However, Vodafone, Orange, 3, Virgin Media and T-Mobile have already beaten the bubbly network to the punch so far, so it will be interesting to see how many have waited for O2 to pick up the Desire.
The HTC Smart, which is exclusive to the network, is also on sale now, with a similar Sense UI interface but much cheaper contract, with all phones available free.
The Smart is coming in white too - if you're into colour variations and all that - so check out O2's site to see what's happening HTC-style.