How much does an iphone 5or 4s cost (w/contract)?

So yes i want an iphone 5or4s i saved up about 1, 000 over the past year to buy an good iphone i'm young really young so susjest some good protective iphone cases i'm turining 13next year so yea and the montly bill?

Added (1). I need all the phone info about the iphone 5or4s i really prfer the iphine 5 but i need like what's the best company to get it from how much are the bills montlyw/contract thaks for helping.

It all depends on how many free texts+data etc. You want but.

iPhone 5 16GB- (fairly good amount of space)
O2 phone company
£49.99 first, then £37.00 per month for 2 years which includes

- Unlimited mins
- Unlimited texts
- 1GB data

Also a protective phone case should only cost around £5. But you really need to find a contract for yourself
However you could get a cheaper per month cost as i doubt you would need unlimited calls texts etc. But then the first price will be not 49.99 but increasing to around £120