About time too. If you are at a meeting you are there for a reason, and leaving your mobile (cell) phone on is both rude and unprofessional.
It’s rude because you should be respecting your colleagues and devoting your full attention to the meeting.
It’s unprofessional because your job for the duration of the meeting is to participate in the meeting.
Distractions like phones should play no part. Turn them off and put them away out of sight. No leaving them on the desk in silent mode; switch off and put away. The world isn’t going to stop if you’re off the airwaves for a couple or three hours.
The Voice of the Bloke at the Back 