Voicemail Greeting from another phone

[#1]

I am trying to leave a temporary message on my voicemail but it is very broken up due to poor signal. Does anyone know if it possible to use a phone on another network to access my voicemail and change the greeting?

[#2]

Hi there, I've just had a look into this and sorry to disappoint but it isn't possible to check your voicemail remotely from a different phone.