Could you hold on a moment, please
Could you hang on a moment, please
I'm just going to put you through now.
I can't get through to his line at the moment.
Could you call me back, please
I think the operator hang up on me. The line just went dead!
I'll call up the theatre and find out about tickets.
I'll ask him to call you back when he gets home.
No one is picking up. Maybe they're not at home.
When he gets off the other phone, I'll pass on your message.