I have looked but couldn't find this information elsewhere in these forums (though the threads are huge, so it could well be there, buried). I was on iPhone contract, paying the rollover amount of £35/month, no longer bound to the contract. I phoned up, and it took 5 minutes to transfer to a simplicity 12 month contract, at £15/month. The website advertises 500MB data usage, but (since I'm coming from an existing contract?), it's still unlimited for the 12 months. I have pre-ordered iPhone 4 from Apple, so the microsim is all that remains. If you register interest on their website, they'll send you a microsim, which you can phone up and activate whenever. Anyway, thought some may find this useful.