What is what does it mean when the phone rings twice then goes to voicemail?

When the phone rings twice and then goes to voicemail, it usually means the person you are trying to reach has enabled their "Do Not Disturb" setting. This setting allows calls from certain contacts to come through while silencing all other calls or notifications. After a set number of rings, the call will automatically be redirected to the voicemail. Alternatively, if the person is on another call or the phone is turned off, the call will also go to voicemail after a couple of rings.