Upgrade 2.2.1 to 3.0
I have an unlocked, jailbroken iphone 3G v 2.2.1 My question is, when the dev-team manage to unlock 3.0, do i have to re-virginize my 2.2.1, upgrade to 3.0 then do the unlocking and jailbreaking all over again? And if i have to do that, will i lose all the data in my iphone? (Like my sent emails, sms, etc2)
How do you back up your mails, calendar in your iphone? Itunes does back-ups, i know that, but does jailbreaking and unjailbreaking change any of that?
thanks in advance