Starting today, both the iPhone 8GB version and the 16GB version are available on prepay.

O2 and The Carphone WareHouse have announced that they now sell the iPhone 3G in prepay version. An 8GB iPhone will cost about 350 pounds and the 16GB version is about 400 pounds.

The handset comes only with an O2 Sim which will give you unlimited browsing and WiFi for twelve months. After one year you can still use the service but for about 10 pounds per month.

Visual voicemail and call merging are not available on the prepay version of the iPhone 3G.