CELLULAR MODIFICATION: REALISTIC PRO-2004 SCANNER: BY CUTTING DIODE D513 ON THE PC 3 SUB CHASSIS IN THE REALISTIC PRO-2004 SCANNER YOU CAN RE-ENABLE THE 825.00 TO 845.00 AND 870-00 TO 890.00 FREQENCY SELECTION. TO SCAN IN 30KHZ STEPS PRESS "STEP-RESET". NOTICE:IT IS NOT LEGAL TO MONITOR CELLULAR TELEPHONE CONVERSATIONS ON THE CELLULAR BAND.