Phones4U have introduced an offer allowing you to claim £65 cashback with any iPhone 4 or iPhone 3GS when purchased online via Quidco.
This applies to a wide range of packages on Vodafone, Orange and o2 networks with both 18 and 24 month contracts. For details of the packages go to http://www.phones4u.co.uk/shop/shop_contract_details.asp?ItemKey=416278
The only slight downside to ordering this method is that current stock is sold out and there's a chance you will end up waiting longer for your phone than if you went in-store, but if you don't mind the wait there's £65 in it for you.
To claim the cashback you will need a Quidco account and then you'll need to visit the Phones4U website via the link on Quidco at http://www.quidco.com/phones4u/?edm146
- if you don't use that link, your purchase won't be tracked and you won't get your cashback.
Of course, always bear in mind that these cashback deals are not guaranteed - if there is any problem tracking your purchase you may not get the cashback and it can take a while before you are paid.