Q: I hear a loud squelch on my iPhone 6

Good day Daylate,

If you are having an issue with your iPhone having unusual sounds such as a squelch from the speaker, I would suggest that you troubleshoot using the steps in this article - 

If you can't hear a person on a call or voicemail or if the sound quality is poor on iPhone - Apple Support

Thanks for using Apple Support Communities.

Safe computing,

Brett L