If you've upgraded your iPhone 3G to iOS 4, you may have noticed a significant slowdown. Although there's no guaranteed solution, restarting your device may help. Otherwise, you could restore and set up your hardware as a new device. You will then need to reselect all the data you want to sync.
If your device is still slow, you may decide to return to your old operating system. Unfortunately, this isn't easy to do, because wheneveryou update the iOS it automatically deletes any old update files from your Mac's drive, and these may be required to run the older operating system. To make a copy of these files before updating to iOS 4, back up the contents of your user name/Library/ iTunes/iPhone Software Updates. Be sure to do this before you connect your iPhone to your computer with iTunes running -
otherwise it may update the iOS software automatically, overwriting those files.
Ifyou've already updated to iOS 4, you may be able to access the older files on Time Machine or a similar backup. Otherwise, you can try to find and download a copy of the files on a third-party website. Once you have them, click the Restore button in iTunes while holding down the Option key. From the dialog box that appears, select the iOS 3.1.3 update file; which should end in 3.1.3_7E18_Restore.ispw.
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