Calls going automatically to voicemail.

[GailWils]

My incoming calls are not ringing through but going directly to voicemail. I can call out.

[Phil_Adelphus]

@GailWils   If an iPhone, make sure it isn't accidentally switched to "silent" mode at the little switch top left on the side.  

[Darren21]

I would do a hard restart on your device to start. It seems like it could be a hardware issue rather than a network issue. Power down and restart. Otherwise double check your network settings. For whatever reason my phone did something similar and a simple restart solved my issue.