Not sure if it's reasonable, but a very simple answer is to get your kid a feature phone, if the intent is to be able to stay in touch/emergency contact (we let our kids bike to middle school and it was nice to be in touch). We didn't get them smart phones until high school.
Though if my kids are any indication, it's still 50/50 - one is on tiktok/snapchat/insta constantly, and the other could care less.