What a good idea. Using a phone whilst driving is downright dangerous.
I know of 2 drivers who have caused serious accidents while using a handheld phone. One was driving a mini bus and nearly killed several old age pensioners. He was banned from driving for 5 years and told he would never hold a PSV licence again. The other drove into the rear of a stationary car at traffic lights.
On both occasions the police confiscated the mobile phones and could prove they were being used at the time of the accident.
Let the word get around that you can not get insurance or pay through the nose if you get caught.