After updating my iOS to 8.1, my iphone-5 experiencing the problems. Mostly it says, phone is switched off or Not reachable.Previously, there was no issue. I think,this not network providers issue. Definitely, this is phone issue.
iPhone 5, iOS 8.1
That behavior sounds like you have Do Not Disturb turned on. Check in Settings to see if it is on, and then turn it off. Also, if it is on, then it is set to block all calls, but if someone calls right back, the call will get through. Turn off Do Not Disturb, then you will receive your calls.
Then contact your carrier. Phone calls are a carrier function.
Phone is not reachable or switeched off??
