It sound likes a Problem with your Phone! Take it to a Phone Repair Shop!
Yes you can unjailbreak your iPhone by connecting it to iTunes and doing a restore. That will set it back to like it was when it came from the factory.
Plug it in to iTunes, press Restore. It should restore your iPhone to its factory settings, thus killing the jailbreak.
this will only happen if you choose to update to the newest apple software. updating music and such thru itunes will not touch your jailbreak
Just connect to itunes Then, under the devices list, right click on the "Bob's iPhone" or "Bob's iPod touch" and click backup. It will back up the current files on the iPhone, so if you restored correctly it will back up only the iPhone.
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You hit the reset button.
All you have to do is update to the latest firmware.
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All you have to do is just hit the reset button.
plug it into itunes and hit restore
You can't you need iTunes.
To 'unjailbreak' an iPod Touch, you have to do a system restore, which is available in the iPod Touch home menu in iTunes. This will erase all content that is on the iPod Touch, including bookmarks in Safari and contacts in the Contacts.