Well you do have a few options you can sync it with your existing account which means totally erasing and re-syncing the phone in this case all data on the phone will be erased and new data from your existing account will be synced. Now you can download a program called Copy trans manager and this will slow you to back up the phone so you don't loose what was on the phone.
plug your iphone into your computer and go into itunes click on your phone under devices go to summary and press check for update or update iphone.
No.
Update the software in iTunes and it will do it for you.
yes. the current update is 3.1.3 and to update to it you have to restore you iphone, update it then re-jailbreak it. but at this moment in time this is not an jailbreak for firmware 3.1.3.
What you do is you go and plug up ur iPhone to the iTunes and click on the update button
The update 6.1.6 helps to maintain the working efficiency for the iphone 3gs.
I don't believe the iPhone 3G can update past 4.2.1, but any newer iPhone can update the same way you normally update an iPhone through your iTunes authorized computer.
Considering updating your iPhone forces you to update to the latest software available for the device, updating an iPhone 3GS now will update it to iOS 6.
Your account should update by itself.
Your account should update by itself.
i dont think so, the latest update available for iphone 3g is 4.2.2 .
3.0 just came out. If your a developer you can get it now. But for everyone else it ships this summer as a free update for iphone and iphone 3G users. the iTouch update will cost $9.95 and will come out at the same time.