What can I upgrade to from a Iphone 4 on Tesco 24 month contract?

So my contract was 24 months at £20 a month and my upgrades due soon but until its due I'm not sure what I can upgrade to. I want the newest iPhone the 5s and will possibly have to pay extra as its so new a pricey however can someone tell me how upgrades work!

Are they free?
Is there a limit on what phones you can choose?
Do you have continue with another contract if you choose to upgrade or can you leave once you've got your free upgrade a buy a sim only contract elsewhere?
Can you upgrade early with Tesco mobile, my upgrade is due 19th November however my phone is broken and I refuse to purchase a new phone seeing as though the upgrades so soon.

Yes you can upgrade. However, if you need some information about apple iphone 5 unlocked you can visit this site http://www.newiphone5.co.uk

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