The term Voicemail was coined by Televoice International (later became Voicemail International) for introduction of the first nationwide Voicemail® service in 1980.
Check Wikipedia and read about their Voicemail article.
A voicemail is an audio recording of a message left by a telephone caller.
You can extend the length of time on a voicemail by checking the options that are listed with it. It will give you the option of choosing to lengthen your voicemail there.
It is possible that police will leave a voicemail on your phone.
Voicemail is provided by your network and you will need to ask them if you can get voicemail.
Voicemail - 2011 was released on: USA: October 2011
For
That depends entirely on the specific voicemail system. Each system is different.
Voicemail - 2007 was released on: USA: February 2007 (internet)
Voicemail is most likely available with cellular service.
Voicemail - 2012 was released on: USA: 15 August 2012