The system comprising a first communication device and a second communication device, wherein when the door is locked by the first communication device, a door locked message is operable to be displayed on the first communication device and/or the second communication device, wherein when the door is unlocked by the first communication device, a door unlocked message is operable to be displayed on the first communication device and/or the second communication device, and wherein when a phone call is implemented by the first communication device, a phone call making log data is produced.