http://www.macnn.com/articles/08/06/25/o2.pay.and.go.3g.iphone/
O2 offers 3G iPhone Pay & Go availability
updated 06:05 pm EDT, Wed June 25, 2008
O2 Pay and Go 3G iPhone
O2 will offer the 3G iPhone as a Pay & Go option – the 8GB device available for £300, the 16GB for £400 – and will include six months of unlimited on-device browsing. Unlimited browsing after the initial six months costs an additional £10 per month, while using the O2's standard Pay & Go plans. Users will be able to "top up" their account with rates varying from £10 to £30, with each tier offering anywhere between 500 to unlimited minutes, and 300 to unlimited in-country text messages.
Users over 16 are eligible for in-store purchase, while online orders require the user to be 18 or older. O2 currently has registration a list for those interested in obtaining an iPhone on launch day.
Fresh-Faced Recruit
Joined: Jun 2007
Demand
If Apple/AT&T made a similar offer here in the States they wouldn't be able to produce enough iPhones to keep up with demand.