Can't see it being a problem really.. There extremely easy to use - as the iphone is - with a bit of practise
Though what they using it for? Like browsing? If anything the problem would be typing i would have thought
Email, browsing, books, skype etc. No gaming other than perhaps a crossword or suduku.
I was showing them the iPhone today and they seemed interested. The problem is my dad is a fiddler.. he can install linux etc but I want something that they can use without him being able to fiddle with it and just works.
The iPhone has accessibility options (such as large fonts) but I was wondering how the apps such as iBooks etc work with larger lettering etc.