Mine was middle school when they started staying for after school activities and going out with friends. I can say I was lucky the first 2 there were no smartphones they were flip prepay. By the 3rd and 4th, one smartphone was out but I had hard limits and restrictions break them then no phone at home it is plugged in, in the kitchen. Only available for a swim, theater practice days for a week or so. They are all adults now and it worked well really had no issues with the phones and responsibility.
Buy this shirt: Michigan the good the bad the ugly and the stupid shirt