My oldest got a smart watch which could make calls only to preset numbers that we added (mom, dad, grandma, aunt, and one neighbor who had a son the same age) at 9. That's when he started getting dropped off at friends' houses without a parent sticking around (mind you - this was just coming off COVID lockdowns, so we may have done it sooner if there was a need to). I wanted him to always be able to reach us in any situation. He's a really responsible kid, so he got a full smartphone the summer after 5th grade (11) when he went on the class trip to Washington DC. Currently in middle school with a smartphone and no issues yet, plus it gives us something valuable to him to take away if we feel he's letting grades slip, etc.

My second does not seem to share the same level of responsibility, so he did not get his smart watch until 10. He may not get a smartphone anytime soon. It depends on the kid.

My youngest is 8. Time will tell about how responsible he is, but Lord - this is the child that WILL need to call us. Always getting into something 🤦🏻‍♀️.