Iphone 4s won't sync to itunes after ios 6.1 update =[?

I tried everything from the apples support page and tried to find answers online but nothing, after the update my songs didn't sync so I went to sync it to my itunes but it never syncs. Any ideas to solve this issue? I did find out that some people have similar problems and many had their iphones restored by themselves when they tried to update to 6.1

If you're undoing this over phone's data connection then the reason might because iOS 6 has problems maintaining connection to 3G network.

Try Restoring your iPhone. If you use quaiyong i have the same problem