I had an iPhone 4S and I kept getting no service issues at times I normally had a full signal I thought it was the phone so I have changed to an iPhone 5 and now have same issue and the SIM card is brand new just got it today
Is there a known issue as I am supposed to get very good coverage in my area this issue happens elsewhere but mostly at my home address
My partner had the same issues at his work but like me before the above update everything was working perfectly