Lots of things, but studies like this as one example: https://www.theatlantic.com/technology/archive/2017/08/a-sitting-phone-gathers-brain-dross/535476/ https:/

Lots of things, but studies like this as one example: https://www.theatlantic.com/technology/archive/2017/08/a-sitting-phone-gathers-brain-dross/535476/ https://www.theatlantic.com/technology/archive/2017/08/a-sit... I still do have a SIM-less smartphone at home for banking / 2FA / etc but the winner for me has been not having it when out and about. I don't want to be taking a photo, I want to be looking at the actual view. I don't want to be looking things up, I want to be chewing through what we think. It's incredibly easy to think your phone is there as a positive reinforcement but in my personal experience, life is better without, especially when it comes down to giving kids your full attention.