Unlock:
Plug it into iTunes with it at the unlock screen. Somewhere it should say "Unlock your iPhone" or something like that in iTunes. Click it. Otherwise do a restore by going to the screen where it shows how much memory you have used up in iTunes and click
Download the latest iTunes to your computer and reset the iPhone. Then re-sync it.
Reset
To reset iPhone, press and hold the Sleep/Wake button and the Home button at the same time for at least 10 seconds. During this time, a red "power off" slider may appear and the screen may go black, but do not release Sleep/Wake and Home buttons until the Apple logo appears.
If iPhone won't turn on, or the display freezes or doesn't respond
More resets:
Try This:1. Remove Sim Card2. Hold in 'Home' button and 'On/Off' button together until Apple logo appears3. Replace Sim Card4. Hold in 'Home' button and 'On/Off' button together until normal phone screen appears.Also, Try this:1.) Shut down the iPhone 3G.2.) Start up iTunes3.) Hold down HOME button on the iPhone 3G4.) While keeping the HOME button depressed, plug in the Sync cable5.) A message will pop up to ask if you want to reset.6.) Just click YES and the reset process should start.
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309
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