Simple iPhone solution... when I OLCI I provide my mobile # and am sent a text message with a URL to the mobile BP. I visit the link and when the mobile BP is on screen I snap a picture of it by pressing the power button and home button at the same time. This takes a "screen shot" of the mobile BP and places it into the camera roll.

Later when I get to security or the club or upon boarding I simply pull up the picture from the camera roll.

BTW, the screen shot can be used to snap a picture of any iPhone screen at any time. I assume the same trick can be used for the DL app which I don't use because I find it useless. It helps to lock into portrait mode or the picture will rotate depending on how you hold the phone. It still works but when i went into the club this week the agent said "its so small" and those are words a guy just never wants to hear.

I also figure having a copy of the mobile BP may come in handy if I have to fight for FF credit later on. Once miles post to my account, I delete the screen shot MBP picture from the camera roll.