"One of the strings carries a “visual_voicemail” identifier,...

"One of the strings carries a “visual_voicemail” identifier, suggesting this might be a feature intended for users of Visual Voicemail — features that aren’t available on all carriers (or they might cost extra)."

Great find, as I said before there has been nothing stopping Google or similar developing a visual voicemail platform, potentially this would roll out on Pixel phones first as an exclusive feature which is Google's usual trick to differentiate and get customers into their hardware (their flagships haven't sold as well as they would have liked but the cheaper 'a' variants seem to be doing a lot better). This would then likely roll out android wide, would NOR be aiming for iOS only if this was the case? And would Apple follow suit?