How to deactivate a iphone 4?

I recently got a verison iPhone 4, not 4s, 4. I got a from a friend. I honestly think he stole it. I'm interested on keeping it. I took it home and noticed it still had signal. So i plugged it into my computer to restore it. I restored it and noticed it still had signal. Is that normal? Is it still traceable? How can i deactivate it. Don't post saying how i should return it. Or how its bad to keep.hes had it for about 3 weeks, the other people surely have a new one by now.

Well, in terms of deactivation, do you mean getting rid of the phone signal? If so I would take the sim card out which can be found at the top of the iphone(that little hole is the sim card tray, so take a paper clip and push it in that tiny hole at the top and the tray should fall out) Hope that helped in some way!

Best of luck with it.
I somehow really messed mine up. As much as I worked with it, the more damage I seemed
to do to it. I'm just not very good with modern technology.
Eventually, I gave up and sent it in for a professorial touch up.
These guys reactivated my phone, and when I plugged it back in it worked perfect.
Check out this company, they rocked

http://www.repairzoom.com/ipad-repair.html

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