My iPhone's unlocked, and I want to restore it. I realize that it'll no longer be jailbroken, but will it be re-locked as well if I restore my iPhone? Or will it still be unlocked, and ready to use with T-Mobile?
It depends on the unlock that you have availed.If it is a temporary unlock, then when you restore it...chances are there that the iPhone will be locked again.If it gets locked...avail a permanent unlock like the one from Theunlockarena.com and remove the network lock in your iPhone 3GS.