Why can I not get my voicemail even with wifi unless my data is on?

[AC Question]

Even if I am running off of wifi I cannot get my voicemail unless my data is on. Is there some way to change this I am not aware of??

 

[STARGATE]

What device do you have and what carrier?
It might be carrier related.

 

[dpham00]

You can dial the vm number to retrieve vm.