At one point in my life I had to have total discretion... But if I texted, I would give an acceptable window of call back (within the hour)to prevent detection by eyes a text should not reach. These days.. If I text, and don't get quick response I will leave another message letting you know to text me anytime so you won't feel awkward or worried to return my message later.
I hope this helps... I also hopes it helps fellow hobbiest to potentially avoid that embarrassing text while your at dinner with the wife and kids