Q: Microphone on my iPhone 6splus makes a very loud crackling static noise

Hello there, 2kidzandapoodle!

Thanks for reaching out to the Apple Support Communities! Sounds like you are having issues with your speakers and the microphones. I know how important it is to be sure both are working properly at all times! Check out this article that talks about steps to do, mainly steps 4 through 10, when it comes to distorted sound on your iPhone: If you hear no sound or distorted sound from your iPhone, iPad, or iPod touch speaker. 

Cheers!