Visual voicemail functionality is implemented in software, that is it does not depend on which components your phone is built with, like Wi-Fi or a camera.
It will however depend on the operating system your phone is running.
(Security Content Automation Protocol) A set of standards for sharing security data developed by the U.
National Institute of Standards and Technology (NIST).
Now you have a phone (smartphone rather) and want to know whether you can have or already have visual voicemail on it.