When my children were young, the question of them having a smart phone never came up (yes it was invented by then). I've read all the articles warning parents not to give electronic devices to children before their teenage years as their brains are still growing and we don't want it to affect them. Yes, and I'm one of those who believe that the mobile phone can cause cancer.
It wasn't until I'd upgraded my phone and we didn't know what to do with my old one that we decided to give it to my eldest to only play games on. He was a teenager by then but he didn't even asked for it. What were we thinking? We just thought it'd be a waste if I gave it away. Bad decision - I should have just given it away!