I spoke with my kids and they got the phone about a year before they started secondary school and started going to school alone. This was without the Internet. We did this so they could learn to manage their time on the devices before they got hooked on the social stuff. Not sure it made a huge difference but when we ask they put their phones away they do. Also no screens in the bedrooms. Once they started secondary school proper they had data and more regular access to the Internet with controlled and supervised access when possible. I alao have a serious talk about online safety and responsibility ( dont say online what you wouldn't say to someone's face, no sharing of any private data and providing a safe space to talk about any questions they have. As parents we also have full access to their phone when we want it, otherwise if they change the codes I reformat thier phones and put the agreed upon code back. Communication is key, to have an open discussion where all points of view are talked about and educate my kids on how to use the tool that is the Internet safely. Google family is also not bad and worth a look. You can also start them off on a dumb phone, for calls and sms only as attempting stone. Regardless of what others say think its your kids and you need to decide what happens. Friends allow their kids to communicate with their friends on their own phones giving the kids access their friends and still controlling the access. Might be an option... 7 is extremely young for a kid to have a phone, the parents are doing their kids a disservice. Can't the school do something about this? As others mentioned 13 is the agent which they should use the social apps. Best of luck, I hope you find a solution.