In case your iPhone is giving exception when you try to sync Yahoo address book with your iPhone , its time you should get iTunes 7.5 or later if you use Windows or Mac OS X 10.4.11 or later if you use a Mac.
Apple confirmed that :
The alert “iTunes could not connect to iPhone because an unknown error occurred (0xE8000025)” may appear when trying to sync your iPhone in iTunes.
- iTunes for Windows 7.4 and earlier
It seems many users are trying to connect their iPhone or iPad with OLD USB hardware i.e. Older than 2.0 where as Apple Recommends High Speed USB 2.0. If you connect to Older USB hardware you can also get errors like :
- Sudden Disconnection when syncing which sometimes result in partial transfer of files.
- If you have used Windows Vista or 7, sometimes you get popup message which says “This device can perform faster if connected to High Speed USB. A similar error message can be seen in this case also.
Solution : Update to Latest version of iTunes and make sure you are connected to high speed USB 2.0.