Microphone only works in speaker phone mode
When I make calls or try to change my voicemail greeting, the microphone on my LG Tribute 2 does not pick up any voice input unless I'm using the speakerphone. I haven't had any problems using voice input for Google searches or Google Maps and since I can still use the speaker mode, I don't think it's a problem with the outside of the microphone needing to be cleaned (there's no dust or lint).
Any ideas? I've only had the phone for a month and haven't dropped/damaged it . . . yet.