Or send texts? Or go on Facebook?
A colleague reports seeing players in the New York Philharmonic doing just that this morning.
Valery Gergiev has been known to read his phone screen while rehearsing the LSO.
Some players found that disrespectful – to them, and to the music.
Others feel it’s no different to using a smartphone in any other kind of work meeting.
So should all phones be surrendered at the stage door?
Your views, please…