How do you undo on the IPhone 4?
Use the back button which is an arrow with an x in it, or some program's will come up with the option like undo typing. You can't actually undo a lot of actions like on a computer for instance, so ...
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How To UN-jailbreak and undo unlock iPhone 3GS?
att is talking at about September 09 but i don't believe it.
Is it possible to undo unlocked iPhone?
same time every year most likely in september
How to undo something you retweeted on the iPhone?
you need update software
How do you undo deleted app from your iPhone?
Re-install said app :-p