Great thread. I did a jailbreak a few months ago, and now realize that i don't use any of the jailbroken features. So, I'm just going to put it at stock. With thi sprocess, will it restore all my contacts that I've input since the jailbreak, or are those going to be lost?
If you restore from a backup yes. But it will leave some traces of the jailbreak behind like battery percentage (if you enabled it), also things like modded carrier name, etc. If you have your contacts in you Address Book on your Mac or Outlook on your computer, you can just restore it, and set it up as a new phone, and then just resync the contacts.