I'm not sure I'm the only person who does this, but I don't think everyone does, so I thought I'd mention it. You quite often find things on your phone that you want to "bookmark". This happens to me when I need to use that email with the magic sequence of characters that will unlock a rail ticket delivery from the machine in Hull station. I don't like having to open the email, scroll to the right bit and then enlarge the characters so that I can read them. Particularly if there are a bunch of people waiting behind me.
So what I do now is open the email, zoom it so that it just fills the screen how I want, and then take a screenshot of the phone display. This is really easy to find later and has exactly the data that I want, with no messing at all. Once I've picked up the ticket I can then erase the picture, ready for the next one.
Works for me.