Our kids don't go places without supervision. Their friends' parents know not to let them connect to their WiFi if they have their phone with them. Additionally I check their WiFi settings on occasion to see if they have any remembered connections (indicating they broke the rules) and if they do they lose their phone for a week (like when grandma and grandpa took them to Disney and my 15 year old tried to connect to the hotel WiFi... not only did he not have the password and couldn't connect anyway, he still lost his phone simply for attempting it).
But when they stay the night with friends I hold onto their phones 99% of the time. They have them for games, talking, texting, and music... none of which they should be doing when they are guests at their friends house. If I need to contact them I call the parents anyway (kids are surprisingly good about not taking their phone with them into the pool).
I don't believe kids should be blindly trusted, nor should technology. But as a parent I find that involving them with technology has major advantages, I just need to take the extra steps required as a parent to assure they're able to enjoy it in a safe environment, and learn that having it is a privilege, not a right, therefore can be taken away as quickly as it was given.
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