i Phone O2 - £495 for 16GB, £595 for 32GB:

O2 - £495 for 16GB, £595 for 32GB:

Currently the only Pay As You Go iPhone 4 to be spotted in real life, O2 charges £495 for a 16GB, and £595 for the 32GB edition. The benefit buying here rather than direct from Apple (if you want to use O2s network) is you get a year's worth of data and BT Openzone WiFi access included with your O2 sim. Of course, this is only worthwhile if you'll use it because...

O2 will charge £10 to customers wishing to unlock their handset, making it more expensive overall. The process generally takes around 14 days.