Frfr I don't push it though. If it's an author I know I'll suggest other books they may also find interesting. t's only in the last third of my life that I started talking to strangers. Every once and a while it doesn't work or I get a grumpy response. Most people like talking about themselves, that has been my experince for the last two decades, with a few exceptions.
I am not certain that people are reading a book on their phone. I haven't seen that many tablets on public transport.