What happens if I update my Jail Broken iPhone?

Jail Braking your iPhone makes it really slow and I really want to update my iPhone. I do not want any of the jail breaking features any more. If I update it from iTunes on my computer will I still be able to use my Phone as a Phone? I have the Iphone 3G.

You'll need to pa for all the Apps you illigely downloaded but you phone will update

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