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I tried to sync my contacts in my phone (Android 4.0.3), and as a result all my contacts in my phone were changed to the old contacts I had in my google accont on the web. For example. if I had changed a phone number to a new one in my cellular phone before the sync, it changed back to the old number that was on the web. Can I restore the up-to-date numbers that I lost? What could have gone wrong?

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Been suffering the same problem with Froyo 2.2 AND Bada OS, had to disable sync, or simply avoid putting my phone online. Stupid overwriting of phone's updated contact data with old. – Marcos Feb 23 '13 at 13:21

I remember having gone through the same problem years back (on a froyo device). Not sure what caused it, but I fixed it as follows:

  1. Exporting ALL your google contacts to a file (make sure everything is in there)
  2. Remove all contacts from google
  3. Remove all contacts from phone
  4. Import the contacts from the file (exported in (1)) to the PHONE
  5. Sync the contacts
  6. Verify whether the sync worked

After doing this two way sync worked perfectly for me. I can not guarantee that this will work for you, but it may be worth a try. Also, make very sure that the export in (1) is complete (check the contents of the file) - also, export to various file formats for safety.

Unfortunately, the changes you made on the phone will have been overwritten and I do not know of a way to revert that. In the future, if the problem persists, you can disable the sync and do it manually using files - it sucks, but at least you won't lose information.

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