Having a child be able to call you and say "I'm in the park", "I'm at my friends house", "Can I invite a friend over?" was very good for reassurance.
We still throw him out and say "Go to the park" on a weekend, safe in the knowledge that if we need to know where he is we can call and ask, or he can phone us to say he saw a friend and is going to their place, etc.
I don't love children having screen time, and we set a timer so he's not allowed unfettered access, but giving him a phone? Even a dumb phone? I think its a net positive.
But on the other hand - the world is digital now. I have no idea how to make them learn good habits on finding things on the internet while not falling to the infinite well of doomscrolling etc.
I'm getting quite pissed at the school seemingly assuming every kid has a smart phone that they need to access things for school with.