internet and voicemail gone after syncing ios 6 on 4S

My phone no longer can access the internet or voicemail after restoring from itunes. Works fine after I Erase All Content and Settings. Once I restore, internet no longer works and voicemail indicator. I worked with ATT support for 4+ hours over multiple days with no resolution. I purchased a new phone as I thought it was my hardware, and it happens on the new phone as well. Any hope would be appreciated.