At the cheapest end of the spectrum iPhone 3G 8gb for a 300 minute per month program at £390 for a 2 year contract versus £459.30 for an 18 month contract.

In the mid range, the yearly savings are actually slightly lower, at around £60 per year which was a surprise to see. .

At the opposite end of the spectrum going for the super cool Aplle iPhone 3GS 32gb the yearly savings to be had from the longer deal are greater, with the prices working out at £480 per year on the 24 month deal and £579 on the 18 month deal a difference of almost £100 for the yearly average.

You can see the full range of prices below, or through visiting the vodafone iPhone Page.