reminds me..on a SpiceJet B738 from Hyderabad to Delhi last year while on finals the pilot announced that someones mobile which was on was disturbing the communications between the them and the ATC and he very sternly requested everyone to check if there mobiles are off.
A girl sitting next to me quietly says “its mine actually…i am waiting for my boyfriends message as soon as we land”. She had to close the mobile off after I gave her a small piece of my mind.