It's taken a while to happen but it now looks like it's often cheaper to buy a SIM Free Smartphone and a SIM Only deal than buying the same phone from a network on a contract.
If you can afford the upfront cost of the handset buying it outright makes most sense as you have the opportunity to move networks at will.
A Samsung Galaxy S2 is around £396 on Amazon SIM Free, or £16.50 a month over 24 months. It's not hard to find a SIM only deal with unlimited data, lots of texts and minutes (200-300) for £12 a month. Total cost would be £694 for 2 years. Comapred with £34-40 a month on a network contract (£816) at best without an upfront handset cost.
If you can afford the upfront cost of the handset buying it outright makes most sense as you have the opportunity to move networks at will.
A Samsung Galaxy S2 is around £396 on Amazon SIM Free, or £16.50 a month over 24 months. It's not hard to find a SIM only deal with unlimited data, lots of texts and minutes (200-300) for £12 a month. Total cost would be £694 for 2 years. Comapred with £34-40 a month on a network contract (£816) at best without an upfront handset cost.