Quitting my telus contract on my Iphone 3gs?

I have a 3 year contract with telus on my iphone 3gs
I want to upgrade to 4 or 4s, is there anyway to do that without paying a cancellation fee? How much is the cancellation fee?

Added (1). Oh yeah, its been 1 year on my contract

Check your contract. Early upgrade may be possible for a few more

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