Check this out... While singing his first single, "Whataya Want From Me", at Monday's Z100 concert, Adam Lambert stopped and told one of the audience to get off the phone... 

"Can you get off your phone?"
"You're not watching tv honey... it's a live show..."

Yeah, it is kinda rude to be talking on your phone so loudly that it interrupts/annoys other people... Some people just dont get it... I hate it when I'm enjoying a movie, then suddenly, I heard a loud ringtone be played and a guy picks up the call and talk really loudly in the cinema hall... it ruins the mood...

Check out this one too!!