Yeap.

bro ben but i just bought iphone if sth happen to my iphone after JB the 1 yr warrenty will not take rite ??

Well.....that's I don't know ar.  I only know if something happen, then you can just restore it.

mt, if you are afraid, then just pay for the apps, they are not expensive.  

JB after 1yr.

or like ben said, if something is working right you can always restore it to its original and it removes all the signs of jb, and most likely your problem will go away too, but if the problem still exists then take it in for repair and at that point they can't tell whether it has been jailbroken (I believe).

yea thats what my friends said too     JB after the 1 yr warrenty end    i cancelled the extra 1 yr warrenty   LOL

okok ...

oh let me take it back.. restoring might not remove ALL traces of jb because some third party apps might save data in certain folders and those data might still be there.  however, it's up to the apple staffs whether they have time to really look for those (using some utilities).

Pretty cool and cute: http://www.youtube.com/watch?v=-hqfWAJ2wJI