One app I like the most is Educreations. I like it because if you are learning a lesson that you don't really get then your teachers can email you a video that can help you with your homework. You can get pictures from the web on the app and from your photos. For instance if I was doing a project on the pillers I can look up pictures of something that can go with it. Also you can record your voice and draw at the same time and you can always watch it. If you are learning a subject you can use Educreations to record yourself doing the lesson. If you are doing a type of math problem you can explain how you did it and email it to your teacher.
 
I think kids should have cell phones because if they are lost then they can contact someone. If they are in a place they are not familiar with and you need to call someone. If you are in trouble and if you are hurt you can contact someone. The age that is appropriate is over 9/10. Those are the reason why I think kids should have a cell phone.