Im not sure if phones should be banned or not in school

Phones are a major distraction if they´re taken to school, and almost everybody has one, there are some people that has even two. They could be used to listen some music, watching videos, texting, bbm-ing, looking at pictures, playing games, amd so much more, during the class; basically, using phones during classes is only gonna make everybody focus... on something else. But we should leave  out of the table that phones are really helpful, too. Your can get in touch with your parents or family, easily, you can also call if an emergency happened, or get called. Using a cell you can easily call the authorities or medical provider, in any extreme case, but we know it could happen. And, you can call for a simple change of plans, or just to know something, also you can tell your parents to bring a homework left at your house, and stuff like that. With all the pros and cons, i cant make up my mind, and tell whether phones should be banned, or be allowed at schools.