Would you allow your 5 yo bring an iPhone to school?

I’m thinking about getting my daughter a cheap iPhone with the purpose of only bringing it to school so that she can call myself or her dad if she wants. Maybe also her grandparents, aunts, and uncles as well. iPhone has a setting where you can turn on assistive access which only allows access to certain contacts and apps on the phone. Am I crazy for thinking about doing this? lol I want her to be able to call me if she feels uncomfortable at school and I know she won’t ask the teacher to go to the office to call me if she wants to. Of course I wouldn’t want it to disturb the class so maybe there’s a certain time of the day that she could call us if she wants. Maybe I could work something out with the teacher. Anyways, She’s starting kindergarten so I want to make the transition as smooth as possible.