Visual voicemail has always been kind of strange on Android.
For the most part, Google has left it up to carriers to provide a third-party visual voicemail app compatible with their service. Alas, most of these carrier-built apps are buggy garbage.
It seems Google is finally prepping to roll out their own built-in solution with Android M. Read More...
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Android Might Finally Be Getting Built-In Visual Voicemail
techcrunch.com