Hello when people phone me and when i phone them people are complaining that my speech is muffled. I know its the handset as people can hear me clearly on my bluetooth head phones. I have re-started my phone several times and i dont like phoning virgin as you usually get through to some clueless idiot in the phillipines
It sounds as if your mic is partly blocked. Depending on your phone the mic has a rubber hood that acts as a sound baffle, water seal, plus dust protection. Sometimes the rubber hood moves out of position and blocks the actual microphone. Other times it may just be dust over time built up blocking your mic.
Has your device been dropped at anytime?
Common practice is to use a thin needle to clear the path for mic also to reset the mic hood. Do not under this if your not confident or know the actual location of your mic.
Compressed air with short burst can also free up most dust, blockages.
You can search your device on G or YT on ways of such practice.
Another thing that's overlooked are covers, cases on device block or muffle the microphone audio. One removed audio fine.
I had this problem with my Honor 8 with a Honor 8 cover supplied by the manufacturer.
Is this a brand new device? If so you should return it.