i have an iphone 4 on 4.2.1 and its on tesco on contract, can i get an untethered...

...jailbreak ? I bought an iphone 4 recently on tesco mobile on a contract. Ive never owned one.

It has 4.2.1 firmware, is it jailbreakable.

And can i do that on a contract, i wont get cut off or void anything
 
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