Well, the subject says it al. My Mi2s has bad sound quality when calling, people can hear me pretty bad and their voice is echoed back to them. My Call noise suppression is set to single mic, on dual-mic it gets even worse with even more echo. When I switch to handsfree / loudspeaker though everything is crisp clear, meaning my mic is not the issue. My radio is M9615A-CEFWMAZM-2.0.128017. I tried covering the back mic as I read that in a Mi2 thread, but that didn't help either. I am running the latest (as of yet) (4.3.14) multilanguage rom. Anyone familiar?