I have basic Verizon voice mail. In recent months, voice mails will ONLY play on the phone's speaker. The speaker phone button is NOT pressed, and in fact, the button displays as though speaker phone is off. At times, the issue seems to occur for certain voice mails. Other times, it does the same thing for all voice mails. Occasionally, clearing the cache, stopping the app, and/or rebooting temporarily fixes the issue, but it always returns. When the problem occurs, it still plays on speaker even when I have working, wired ear bugs plugged in. It makes no difference if I turn bluetooth on or off. I only have three voice mails right now (so very few). I have a Samsung Galaxy S10.