How much are the iPhones?

iphone 4, the newest version costs in the US:

with contract from AT&T or Verizon 16GB $199, 32 GB $299.

unlocked 16GB and 32GB $649.

In the UK:

unlocked 16GB £510, 32GB £612.

O2 Pay as You Go 16GB £504.99, 32GB £609.99. (these are locked to O2)

with contract from O2 16GB free to £304.99, 32GB £49.99 to £349.99