wayback i bought a ol` iphone 3 flashed to unlock it, and when i try the #("sry, i forgot the number")* was it 06(?!) code or looked in the iphone settings it s

wayback i bought a ol` iphone 3 flashed to unlock it, and when i try the #("sry, i forgot the number")* was it 06(?!) code or looked in the iphone settings it shows: "unknown device" or something about "can`t be displayed"... confused