What is the button for, Kev? Surely the phone is touch screen for most operations.
Yes most stuff is, you need it to get into the phone at all, not everything is on the screen, they are a good phone Geoff, just not as intuitive to use, the Android stuff generally has three buttons, some electronic, my S5 has one physical button to basically wake it up, to the right of it is a back button, to the left is a all app button so you can scroll through open apps, and close some or all, the iPhone is less intuitive, iPad is the same, they do work really well, but the learning curve (for me) is quite steep), I never struggled with Android, regardless of make or age, that's another option of course, LOADS of makes, one basic OS, and loads of choice, with apple, less choice one make, and a few models.
Maybe talk to someone locally who has one who can let you mess with it, see if you can grasp it or not, before buying.
FB mentioned updates, you get the option to do this or ignore it till later, so not really a issue, and you do need to do the updates, both for the OS and the apps, as mostly they are making them more functional, also (might be wrong) iPhones are not alway expandable for memory, some don't even have a flash for the camera, in a lot of ways they are advanced, in others retarded, Android deffo has the largest following I think, but not by much, most phones are made in either Japan or China, China produces some very cheap but more than adequate android phones, names you never heard of, I've had a couple, and they were fine.
I'm still using my first Android, works as well as the day I got it, a samsung S2, I also have the S5, to be honest not much to choose between them except I can get 4g on the S5, the S5 is perhaps a bit faster to do stuff, but not much, S2 smaller too.
I have my old S5 on Ebay right now, the camera stopped working, but the rest is 100%