[nano9]

Besides having one thing fewer to carry on your person, I don't see the point. Aren't passports already cryptographic devices, containing your information for external lookup and verification? Why move that to the phone? If anything that decreases security, and it's not like your need your passport available commonly enough like a bus pass to warrant moving to the phone. Passports with a chip offer fantastic security in a discrete package, and if the future is to move this to the phone then I will be a bit disappointed.