My iPhone 4s will not make or accept calls I have done a factory reset on my iPhone 4s and it will no longer make calls or receive them. It goes straight to voicemail when called, and when I dial out it just beeps twice and disconnects.
This would have nothing to do with the phones settings, have you tried calling your contract provider? If that doesn't fix the problem i recommend taking it to the apple store where they can do a diagnoses of the problem.