Yes, kids in those grades, may have phones already.
And yes, an iPhone already at only that age/grade.
They are too young for an iPhone/smart phone. My opinion. I don't care if they have it because they "inherited" their parent's old iPhone etc. They still to have a data plan etc.
They don't need it.
If they do need a phone, a regular basic non-internet phone is good enough. BECAUSE it is to call their parents. NOT for "social" interaction reasons, like adults use phones for.
My daughter is in middle school now. She is 10. She has a phone. A basic phone. No texting, no nothing. It can just make calls. To us.
In school, schools do NOT let the kids have the phones on, nor on them. It has to be kept, IN their backpack. For most schools, this is a rule. Some are even more strict than that. Not unusual.
The thing is: at these ages and even for Teens, phones are a SOCIAL apparatus. It is NOT just a phone to make calls. Kids use it, to play games/apps, text, go onto social sites like Instagram etc., use their phones to take photos etc. and they also give out their cell phone numbers, willly nilly. Kids also, make crank-calls to others. Even to other parents. I know this, because my daughter tells me. And I know 2 Moms that were getting crank-calls from kids and they recognized the kids' voices. Many kids, have NO discretion nor any common sense, about the use of their phones nor about the PRIVACY of their own phone numbers or others. Kids give out other kids' phone number to others too... even without permission and then other kids who they don't even know, ends up with their phone number.
Anyway, my daughter has a phone. A basic phone. Only to make calls. To contact us.
She is very responsible and mature for her age and asks permission to make calls and keeps her own phone number, private. She is NOT allowed, to give it out. Only if we give permission. And she adheres to our rules for it.
Yes, kids have phones. Of all sorts.
Whether or not they know how to use it wisely or not.