Audio quality decreases on mobile device

I'm recording in Auditon and on my computer, it sounds great, even after I export it as an MP3 file. But when I listen to the file on my phone, the audio quality drops drastically. It sort of sounds like the audio is constantly peaking, even though I know it's not. I wish I could say it's just my phone being old (it's an iPhone 7), but when I listen to music, youtube, etc. through my phone's speaker, it sounds just fine--it's only my recorded audio files that sound low quality. I have tried listening to my finished edited audio, and completely raw audio, and both have the same sound quality issue on my phone. I'm working with a ShureSM7B microhone if that makes any difference. If you have any idea why this is happening or any advice on how to fix it, I would be eternally grateful. Thank you so much!