Have you been to a concert venue where you are given a special locking pouch that keeps phones locked within a designated no-phone zone, outside of which the phone can be unlocked for your use? Most likely those pouches are from a company called Yondr. They are gaining popularity with performers such as The Lumineers, Louis C.K., Alicia Keys, Dave Chappelle to cut down distracting cell phone sounds and texting and talking during their performances. Dave Chappelle is also using the system to cut down on people video recording his show and sharing the material online, possible driving away others from coming to a performance because they think they have already seen all his new material. Now schools are beginning to use the system as well.