The 4G Promises from Vodafone is so much better than o2 right ? So O2 say they will give you 10% of and pay any vat? When vodafone will give their customers 70% off. I'm wondering whether to join o2 on a 2 year 3G contract or wait. I do not get how the networks can offer you a 4G contract if the iPhone 5 cannot run on the frequencies the networks have.