I’ve almost given up using my mobile phone during the pandemic. I’m at home most of the time anyhow. When, at first, it was announced that the security services would be following our every movement (that seems to have been defeated in court for now) I decided to call it quits. I would leave it turned off except when I absolutely need it. The rest of the time I switched on the follow-me service so that when people call my mobile number the call gets transferred to the house phone. People are often surprised how quickly I answer, because the action of picking up a desk phone’s receiver from its base is usually quicker than locating and then answering a smartphone.
As for the other things a smartphone does, I don’t need them most of the time – I can do most of them on the computer.