This doesn't involve a mobile phone (at least not yet), but it shows how valuable scanning an image in the physical world will be.
From NY Daily News N.Y.C.'s crime fight to get more eyes
The NYPD is installing 505 surveillance cameras around the city - and pushing to safeguard lower Manhattan with a "ring of steel" that could track hundreds of thousands of people and cars a day, authorities revealed yesterday.
The NYPD also has applied for $81.5 million in federal aid to install surveillance cameras, computerized license plate readers and vehicle barriers around lower Manhattan, Police Commissioner Raymond Kelly said.
The cameras capture images of license plates and drivers' faces. Officials then run the license plates through a database of stolen cars and terrorism suspects