On the iPhone the Visual Voicemail (voicemail screen) uses data. Basically all the voicemail messages are transferred to your phone using data.
Now if you call your voicemail (holding down the "1" let or by calling your own cell number) then that uses minutes.
The iPhone 8, 8 Plus & Apple Watch Series 3 are here!
Find out how to track your iPhone's delivery!
Let us help you upgrade and activate your device!