Is it really the damn phones?
does your phone make your life worse? are you addicted to it? why do phones improve/worsen lives, or why does it do either for you personally speaking?
It will depends of the apps you're using and how it's used.
For example social medias is a mega brain rot for everybody, lot of people are addicted to it, to the point it shapes their environnement, their social life, their own perception of things : To the boys following cults and retarded advices, to the girls following self-harming & self-sabltaging advices/trends, to the people glued to their phone while driving, while walking without being aware of their environnement and the consequences of a lack of attention.
People are also addicted to it late at night, nuking their sleep quality and worsen their health overtime.
BUT it would be a lie to say that phones hasn't improved some parts of life quality like ordering things, learning, finding answers to our questions, keep contact with our loved ones, finding tutorials, calculations etc
If you feel like your smartphone is ruining your life, never hesitate to switch it with a feature phone