Patent ID: 7747636

Claim:
A method comprising: optically sensing a device in an area of a real estate for sale, said device including a unique indicia indicative of the real estate, said device being wholly passive, and said optically sensing comprising sensing a wholly passive device, wherein said optically sensing comprises using a camera in a mobile phone to obtain an image of the indicia; from the mobile phone which is capable of wireless communication, signaling, using said indicia from said device, to indicate a request for additional information about the real estate, wherein said signaling comprises using a camera in the mobile phone to obtain information about said indicia, and send said unique information to a remote server; and receiving information on the mobile phone about said real estate responsive to said request, wherein said information is obtained from a remote server which stores information about plural different real estate, and returns that information responsive to said signaling, wherein said server returns three-dimensional mapped information about the property for sale, and wherein said server returns information about other properties for sale in the vicinity of said one property whose unique indicia is received.