Stop talking and wait for them to look at you as to say "why did you stop". Then respectfully say "I see that you must be busy, if you like we can do this anoth

Stop talking and wait for them to look at you as to say "why did you stop". Then respectfully say "I see that you must be busy, if you like we can do this another time". The trick is not to come across as condescending and that what you have to say is more important to them than what they are doing on their phone.