I lost data services about 4 hours ago here near Reading, PA. Called Verizon support.
They checked and told me it was not a local tower or other issue. Had me do a factory reset of my phone.
Damn glad I have the My Backup Pro App and a current backup to reload from after seeing this thread.
Support is shipping me a Factory Refurbished GS3 on Monday. Doubt I will keep it if this is a network issue and not my phone.