I have no trouble reading a book on my iPhone on the subway. The ride just isn't long enough to make having internet access an issue.
> it's not safe to use or show your expensive anything on most of the subway lines.
During the day, almost everyone has a smart phone out. I've never had a problem, never expect to.
>Majority of that stations are very dirty, cars are just tolerable.
The cars are generally quite clean, and air conditioned. The stations can be dirty, but no more than the street is. You're not supposed to be licking the floor ...
> During rush hours NYC subway riders stuff like sardines in the...let me find a picture
Depends on the line and how much of a rush you're in yourself. Either way, there's room to read.