I have sent several email to one of our company customers, but I did not receive any response from him. Today morning I called him for asking why he does not answer my emails?!!!
He said "I use Yahoo email, and these days this service has been filtered by government". I asked him " Why you did not call me?" , He answered that he has called me severla times, as he is a honest person and I have had no missed call , then something is wrong in MCI.