I haven't got the NHS app, and I haven't got a 'smart' phone so I couldn't have it anyway. My phone is a means of communication, not a means of control.
I am particularly concerned by suggestions that people might not be allowed into bars and restaurants (or theatres, concerts etc.) without having the app in order to prove they have been vaccinated. Supposedly, this would be a measure to encourage young people to get vaccinated. The real effect would be to force many people to have a smartphone and an app, through which their whereabouts and even some of their behaviour could be traked and traced.
Maybe I am being paranoid. But then again, maybe they really are out to get me along with the rest of us.
In any case, by the time I had paid for the smartphone, I would have spent the money that I could have used going to the pub, eating out or going to a concert, so I am NOT going to do it.