What will I lose if I unjailbreak my iPhone 4?

So I have had my iPhone jailbroken for a while and now i want to update to IOS6 and just simplify my phone, how do i unjailbreak it and what will I lose if I do, I just don't want to lose message history and photos.

To unjailbreak… Simple connect to Itunes, back up photos… And RESTORE… All data on the phone will be wiped and lost… Download ios6… Restore photos… Walla… Enjoy… Sorry… Facts of life with iphones…

  • Would I still get my warranty if I unjailbreak my iphone 5? I heard if you have an jailbroken iPhone the company won't fix it phone, if anything would happen to it.
  • Why can't I unjailbreak my iphone 5? I want to update to 6.1.2 but I'm jail broken with evasion and when I connect if go my computer to restore it takes a long time to load and says that it's up to day or something and when I check my software update on the iPhone it never loads and when I tried resetting it it never finishes what can I do? How do I unjailbreak when nothing's working
  • Should I unjailbreak my iPhone 4? Should I? It's slowing down and i don't want to mess it up anymore. Should I unjailbreak it?
  • IPhone 4s won't unjailbreak? So I tried to unjailbreak my 4s and update to 5.1.1, but when I did I got an error 21 and now the phone is BRICKED. I can't kick it out of recovery, iTunes WON'T restore it. What can I do?! I've put it into DFU mode and even tried restoring it with an IPSW from a 3rd party! Yes I'm on the latest *** version of iTunes, yes all my ports work and there's no web security because it. A MAC