US Patent 8091774 Printing system using a cellular telephone

A printing system is provided having a cellular telephone which has an input at which a print medium is loaded into the telephone, a printer, and a sensor for sensing an identifier of the loaded print medium. The cellular telephone uses the sensed identifier to determine whether or not the loaded print medium is a valid print medium on which printing can be performed by the printer. If the loaded print medium is determined to be valid, the cellular telephone controls the printer to print on the loaded print medium. If the loaded print medium is determined to not be valid, the cellular telephone ejects the loaded print medium at the input.