iPhone 4S Sync Problem

Is that really the extent of the message?  Generally iTunes is more informative when something errors out.

I just connected the phone to try to sync and replicate the exact message. It finished the sync this time. Last night it was doing the same thing on my iMac (which I used the morning) and my MacBook Pro. Seems to me I had the issue om=nce before too. If it happens again, I'll re-post the exact error message.

The iPhone, like all iDevices is designed to sync to only one computer/library.

Attempts to sync to other computers will cause issues and likely will remove content from the device.