Has anyone else had call quality issues with their Icon? I like everything about the phone, it is a nice upgrade to my 928. However, the people I call can barely hear me unless I use speakerphone or talk VERY loudly, both of which are not practical. Thinking it had something to do with running DP8.1 I used the NOKIA software recovery tools to revert back to WP 8. Still have the same issue. I love my Icon, but it is unusable for it's primary purpose...as a phone. Bum unit or known issue?