When I press play then put my phone to my ear, my phone goes to the lock screen and the voicemail message stops playing. I have my phone set to lock automatically after 1 minute, but it still locks right after putting the phone to my ear. Works fine with speakerphone as I'm not needing to put the phone to my ear, and I've never had any issues with phone calls when the phone is at my ear (screen turns off to prevent button pushes, but does not lock with phone calls). I prefer visual voicemail so I don't have to enter a password every single time I get a voicemail, but I'm not always in a situation where I can just put it on speaker. I saw this addressed here on old posts, as well as other websites, with no solution.