Barry wants to know if he has to update his iPhone's OS. He's worried the update could brick his phone. Leo says that's always possible with updates, but the benefit of having the latest OS outweighs the slight risk that it could hurt the phone. He should always update because there are security patches and critical updates that are a must. Sometimes there's a bad update, but it's really rare, especially in the iPhone. There's new features in iOS 10 that make the phone run smoother as well.