I'm waiting for a flight at the airport, there's nothing to do at all. Who knows good entertainment on a mobile phone, not just to stare at the screen?
If your child is so interested in computers at such an early age, then I would recommend that you try to teach him how to play on them. And then in my adult life I had a problem where my mother confined me to a computer as a child, and now that I'M an adult, I can't get my head together and start planning for the future, because I keep playing chicken road and I can't stop. Therefore, do not limit your child to spending time at the computer.