I downloaded and use
VLC on my computer, so far it always works for whatever format, .wav, .mp3, .mp4 etc., and for my cell phone, the app I use is Audify Music Player I downloaded to my phone from the app store on my phone - same story, it works with everything and both are free.
I only listen to sermons/talks/conferences, mostly on my phone but sometimes on my computer and am very happy with both.