A:AnswerIt has a built cell phone SIM card tray but I find that WiFi works best because it depends on the reception of the carrier and where you are trying to secure.
A:AnswerTechnically you could use the sensors on anything as long as they are installed correctly. You must use them with the system so as long as your car is Within range of the main hub, if your alarm is set it will detect it being opened.
A:AnswerYou may try a different battery or removing and adding the sensor again. Sometimes the connection between the sensor and the home base needs reconnected.
