The Vikings Weekender is a small weekend tournament held in Canberra, Australia each year. This year there are 57 players playing, with a time limit of G60m+10s per moved. As it isn't FIDE rated, I (the arbiter) have a little flexibility with some of the rules. For this years event I am trialling a different set of penalties for Mobile Phone Infractions.
Instead of the instant loss that the current FIDE Rules prescribe, I instead announced a two-step system. If a players phone makes a sound (ring, beep, trill etc), the player will be given a warning and the opponent will be given an additional 5 minutes time. If it happens a second time the player will then lose the games. Note: Players are still forbidden from conducting conversations on the phone if it does ring.
As for how it is working in practice I cannot say. By the end of Day 1, no ones phone made a noise.