I have a 7 inch kindle fire. I have tried using that to access the net but I am incapable of touching the right letters. I gave up trying to log in to one site when I just could not get the password right, so I'd have no chance using it to reply on here. If I can't cope with a 7 inch screen I hate to think how I'd cope with a phone. Our elder son is trying to get me to use one but I'm sticking to my old one that just makes calls and sends texts - at least I can find the buttons on that
Having said that, you should have seen me trying to control a mouse back when I first used a computer