I have an iphone 5s.
sometimes a call goes right into voicemail w/o ringing. 5 minutes later (when i am in the same location), a call does ring.
it is not consistent.
i tried dialing *73--did not work.
i don't have the mute button or do not disturb on.
is there any way to fix this?
I don't have the iPhone (any version!) but have had the experience of a call going to voicemail when there is a good signal, other calls DO get through, and the phone simply never rings - I just get a notification that I have a VM. It seems totally random, and I wish I could be more help! Thankfully, for me, it doesn't happen often, but it does happen.