I don’t understand why voicemail really needs ti be a separate service involving forwarding and such. Couldn’t there be an app that picks up an unanswered call after a timer, plays a greeting, and records the reply? Couldn’t that all be on the device?
Or is there some technical limitation that I just don’t understand? I haven’t found any such app, and all voicemail apps seem to be services that forward calls remotely.
There are apps that do this, or try to. But I think they need root, and success varies a lot by phone manufacturer and country of origin.
For one example, there’s an old Android app called Telman real answering machine. I doubt it works on modern phones. Might work on an older model.
Corpos lock shit down tight, because they think they need to own all of it.