I would like a long-lived smartphone, for me and my mom. She has an iphone 6, and I have a iphone 7. We don't change phones very often, as you can imagine for yourself. So what could be a better choice, in relation to quality / price and longevity at good / high levels? I state that I can have, through a friend, an iphone 11 for 450 euros. Is it too much in 2021? Is it worth? Otherwise what do you recommend?