Kenny wants to get an Otter Box for his iPhone 7 Plus, but he hears that there's a rainbow effect with the screen protector. Leo says it could, if he used it. Leo doesn't put it on. It'll protect him against scratches, sure, but the glass of the iPhone is very hard. He can get a sapphire glass cover, but the problem is, he'd have to keep that protected as well.
The Otterbox is very good at protecting the phone, and most of the time, it'll hit on the case, not the screen. Leo recommends them. But if he's worried, Kenny should get the model that has a lid.