[Tafflad]

GS4 on Vodafone ..running 4.4.2
I have missed a lot of calls in past week ... caller reports either going direct to VM ... which could be explained by bad signal .. but also worryingly reports of it ringing out and no answer (eventually going to VM)
Texts working fine .,.. and I get Vodafone 'missed call texts' straight after call ... that is how I know I missed them.

Twice I have tested .. and from another phone I can hear ring tone, and if I look at display on GS4 .. there is an incoming call .. but no ring or vibrate.

I checked that it is not set to silent .. or any blocking mode set.

I 'cleared' problem ... by setting to silent and then setting back to ring .. and it then works OK .... are there any known issues with phone going into silent mode ?