Voicemail Notifications On The Exalt

I have an exalt and use US mobile. I don’t get voicemail notifications.
Now I am in Israel using tripletel in the same phone and now I do get voicemail notifications. Anyone has experience with this.

I heard it’s a carrier thing

Is there something US mobile can do about it?

Yes call your carrier, ask them to fix, wait a few hours.

yups you just need to call them and they will enable it

I have the same issue here,
US Mobile is telling me that I need to change to dark star (at&t) or light (t-mobile) in order to fix. I want to continue to use warp (Verizon). Is there anything to do about this?