iphone 5s 9.2.1 IOS sound on calls and messages not working all the time
I have an iphone 5s 9.2.1 IOS
The sound on calls and messages not working all the time. Only occasionally will I have sound on calls and messages. The phone is not on silent the ringer is on and turned up.
Any ideas about how I can fix this?
Thanks in advance
iPhone 5s, iOS 9.2.1