I figure that I miss about 40% of my calls because my phone does not ring or vibrate. People tell me that it rings on their end. Once in a while in these situations the phone will ring once on my end and then go to voice mail. When I call back immediately they say it rang like 8 times on their end... This happens to people who call me regularly so they ring sometimes and other times not....so I don't believe that it can be a setting thing.. Any suggestions???