Originally Posted by
RichardKenner
I don't use them for technical reasons: in most (perhaps all) cases, the BP doesn't live on the phone, but is downloaded at that time. So it depends on good Internet or WiFi access. And what if I need to do something else important with my phone at the time? Or if it needs a reboot?
I think it depends on the airline, some allow you to store the document on the phone so you don't need a connection at the checkpoint, and for the ones where a connection is required (not even sure there are many of those left) you can do a screen shot of the code and save that on the device just in case you can not connect.