Disable everything on your phone besides most essential apps

especially as someone with ADD I often played with the thought of getting a flip phone, but to be honest besides the 90 percent where I use my phone for brainrotting activities and overstimulation, I stil don‘t wanna miss Whats App, google maps for navigating and a solid camera. I wonder if there is any way of basically banning everythig on your phone by password, including any browser, and just allow the most needed apps. Right now I‘m using an iPhone, so I gues I‘d have to sell that and get an Android anyways, but has someone thought about that allready?