Can't edit voicemail number V20 T-Mobile

[s.pearce88]

I can't edit the voicemail number on my T-Mobile V20. The option is greyed out. I was wanting to edit it so when i press 1 on my dialer , it will call my Google Voice. Does any one know of a way to edit the number ?

 

[Javier P]

Duplicate. Please see response here.

https://forums.androidcentral.com/showthread.php?t=793494

Thread closed to avoid parallel discussions.