Mobile phones for my kids

For his 10th birthday, my son had asked for a mobile phone of his own. I bought it for him. Previously, the kids had shared a 2G (talk & text only) old people's flip phone, because I felt they weren't really going places on their own so it was enough for one of them to have it with them. But, this led to arguments as to who was allowed to carry it... so finally, I decided it was time. N(11) will…