Call Sound Issues with iPhone? 23 Tips to Troubleshoot & Fix iPhone Call Quality Problems | OSXDaily
4 Key Tips to Clear Muffled iPhone Audio - Fix My Mobile
What to do if your iPhone sound isn't working or sounds muffled
iPhone Muffled Speaker? Here's How to Fix It
Why Does My iPhone Make A Static Noise? Here's The Fix!
Use a Low-Frequency Sound to Get Water Out of Your iPhone - CNET
Yesterday, I was trying to clean my iPhone speaker with a toothpick and accidentally poked a hole and now the sound sounds muffled and weird. What do I do? - Quora
4 Easy Ways to Fix Speaker Distortion - wikiHow
If your ear-speaker is muffled, try this. : r/ElectronicsRepair