answering machine; answerphone
A device or service that records voice messages when a phone call is not answered. Common in both landline and mobile contexts.
Please leave a message on the answering machine.
When I checked my mobile's voicemail, there were three messages.
I couldn't answer the phone, so I left a message on the answering machine.
I listened to the answering machine as soon as I got home.
I set the answering machine before going out.
Since no one answered after several rings, it switched to the answering machine.