Has anyone tried this recently in ATL? Just look for a sign that says "Mobile Passport Control"? I've read a few stories about contractors not knowing what this is and wanting to send you to the regular line. I guess you have to be ultra persuasive and convince employees that this really does exist?

Also... my flight into ATL may go to the E or F terminal/concourse. Anyone know if Mobile Passport is available for *both* of those terminals?