for iphone users… doesn’t listening to a voicemail mean you’ve been made aware of a recent call?

i’m playing tennis. i miss an incoming call. the caller leaves a voicemail. when i’m done playing tennis, i check my phone, and see that i have a recent call and a voicemail. i listen to the voicemail… which means i’m aware that that person called, yes? so why do i have to go to […]