No 3G but have wifi- have been on phone with apple and provider for 5+ hours total. Ideas?
I'm not sure if you said where you got your phone fixed (I double checked, but I could be missing it), but who fixed it? Was it Apple, a friend, a repair shop? It sounds like something could have been either damaged or disconnected and not reconnected correctly in the repair process.

If you have done a full restore to the device (both from an iCloud/iTunes backup and set it up as a new device) then it is probably damaged physically. You need to contact whomever repaired the sleep/wake button.