Can I upgrade to an iPhone now?

So about 14 months ago I started a contract with Tesco Mobile for a Nokia X6.It was to last 2 years (so I have about 8 months left now).
I actually lost that phone half a year ago on the bus and had to get a really cheap new one which in all honestly can't do *** all. So I want to upgrade to an iPhone.
How do I upgrade or switch to an iPhone? May I also say that Tesco no longer sell the X6 on contract, if this helps.

There's only one way that you can upgrade early. You would have to pay the remainder of your contract off. You have 8 months left, so you would have to pay the equivalent of 8 times your monthly fee plus any early termination fees.

This will then free you up to take out new contract.

You can upgrade to an iPhone now. There are lots of online selling market place in the web. You can search a good one for you to sell the phone. If you advertise your product in the market place then the real one will contact with you who are willing to use your phone to know about the pros and cons of your phone.http://www.cellitused.com