Can you unjailbreak and iphone 4s?

I want to jailbreak my iphone 4s. I don't have it connected to itunes or anything. I'm thinking about using jailbreakme.com. But I wanted to know before I do it if there's anyway to unjailbreak it if i decide i don't want it. And will it mess with my phone service in anyway? I have at&t. Will I be able to sync it to a computer if i decide to?

If you jailbreak it & then you decide you don't want it Jailbroken & your restore everything, it won't matter if you delete restart the phone etc etc itll forever be Jailbroken, it can probably turn on or off randomly (mine does that because I jailbroke it & decided to unjailbreak it because it was slow & now it just randomly shuts off & turns off) it works good though. But it's really cool to jailbreak it, there's so many cool stuff. But are you still in contract with AT&T? Cause if you are you should wait until it ends that way if you mess up the iPhone you can get a new one & if it's Jailbroken you'll have to explain what you did. Goodluck!

Resetting the phone will unjailbreak the phone. You can either reset the phone or backup now and restore the phone on iTunes.