Chosen Solution
i recently got a 6S+, and i didnt notice any issues for the first month or so. but as of this week my outgoing voice chat on a phone call has been non existent. in the standard handset mode im going to say 80-90% of my speech is not picked up, and what is picked up is very muffled. in speaker mode its better, but its still muffled. i can at least have a conversation this way. Voice memo and video both capture my voice perfectly. Siri understands me just fine too. ive removed the phone from its case - no change. ive swapped my sim out with another 6s+ and tested both phones while standing in the exact same spot. no issues on the other phone. this rules out a network issue. i swapped between regular cell reception and wi-fi calling. no difference. did a “reset all settings” with no change. went through itunes “upgrade” in recovery mode with no change. does this seem like a software or hardware issue to you guys? buying a new lightning/mic cable is cheap enough, but i really dont want to go to all the work of swapping that guy out.
Sounds like hardware to me. You have two microphones on the lightning connector, that’s why you are being heard perfectly in voice memo and muffled in call. Check to see if the line of holes at the bottom of the has pocket lint or is just dirty. If so clean the holes. If not you need to replace the lightning connector. Lightning connector has both of these microphones, so replacing the lightning connector should do the trick if cleaning did not. Tutorial: iPhone 6s Plus Lightning Connector and Headphone Jack Replacement
