Currently Being ModeratedMar 15, 2013 6:42 AM (in response to Na755)
This is a carrier related problem. Contact your carrier.
Currently Being ModeratedMar 15, 2013 6:43 AM (in response to Na755)
Have you contacted your carrier to insure your account is provisioned properly? Have you tried turning your phone off, removing the sim, then reinserting it? How about: Settings>General>Reset>Reset Network Settings?
Currently Being ModeratedApr 11, 2013 2:32 AM (in response to Ralph9430)
It isnt carrier problem. I had 3 months old iphone 5, no problems with network but had light leakage, got replacement 2 days ago and with same sim card there was always no service. Went back to apple store and they will give another replacement tommorow or monday.