The address book it is syncing with is shown in the Info tab in iTunes when the phone is connected. He may have set it to sync with iCloud; in that case the contacts are in his iCloud account.
This issue is complicated by the fact that you are using an unsupported configuration; unsupported OS X and unsupported iTunes version.
I have no idea what comments you have seen re iTunes 11, but it has performed flawlessly for me since it came out.
When the phone is connected to iTunes and you select it in the Device pane and look at the Info tab, what is the selected program for Contacts? This is the location of the contacts the iPhone should be syncing with. It is possible you have it set to sync to something like Google or Yahoo?
I'm not going to judge your other comments, however if you end up having to restore the device, it will have to update to the latest version of iOS, and for the iPhone 4S, that is 6.1.3, and you will need the latest version of iTunes as well. Not sure what problems you are expecting in iTunes, but I have not experienced anything, and I use it on Windows, which many determine to be the worse version of iTunes.
Message was edited by: ChrisJ4203
thanks for first advices, contact is set to sync with address book. I do not think it is a version issue overall, as I have three user accounts at my MacBook whith each having its own iPhone connected.
The one where before other phones were synced via iSync (Nokia, etc) and where we switched to iPhone, have the same problem. The third account of my daughter, where her first mobile phone was an iPhone, syncs withouth any problems.
I therefore think that iTunes/iSync still use the old Nokia file - although I deleted address book, caches, preferences, etc there is still a wrong link.
just found out how the get rid of the old contacts that iPhone was attached to. I share it here in case anybody else should have the same problem.
- In the finder select "go to folder" and enter /var/db/lockdown. Delete all the files included there (but leave the empty folder intact).
- Go to use/library/Application Support/SyncServices and delete the file named "local".
- Restart the computer and also the iPhone.
- Connect iPhone and replicate as usual.