Today I received another email from PADI advertising their e-card. Although I tie my PADI and DAN cards to my regulators so I don't inadvertently leave them at home, I also have photos of all cards on my cell phone. In the event I find myself with an unexpected opportunity to dive at some time where I do not have my regulator/cards with me, I wonder if anyone has had success using a cell phone photo of the cert card as verification. Thanks in advance.