Hi guys
If I jailbreak and unlock an American 3G for using it in other country,can I reverse the operation after getting back and make it in a way that not screw the Warranty?
(I mean reversing both unlock and jailbreak)

Thanks.

Yes, you can do that

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Could you please help me more?

All you have to do is restore it with itunes and it will get rid of the jailbreak and the unlock. If for some reason you change your mind and keep it and still want it unlocked do not restore it to 2.2.1 firmware as that will cause yellowsnow to no longer work.

as I remember of my experiences on 2G if you unlock and just restore with itunes you wont get rid of unlock and on the iphone when it says"connect itunes to activate(or what it was)"you hav ethe carrier on the top left side of screen which means nothing went nowhere?am I wrong?

Differnt story on 2G. Bootneuter neutered the baseband and unlocked. due to the beseband not beeing changed from FW 2.0 to 2.2.1 it stayed unlocked. Yellowsn0w works different, restore reverts to factory state.

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iPhone 3GS factory unlocked (3.1.2; Blackra1n, Cydia, OpenSSH, custom 3.0 ipcc file (no sig), tethering hack by Dev team, 32 GB)
iPhone 3G (3.0.1; Redsn0w 0.8, Cydia, OpenSSH) 16 GB

thanks a lot guyz.and activating again in US wont charge me,am I right?

Yes, you are right

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If you want to re-lock your iPhone but remain jailbroken, you can just uninstall yellowsn0w in Cydia or installer.

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