Wi-fi signals from laptops and iPhones helps to access many things while moving but it also has the possibilities of attracting burglars.
According to Credant Technologies devices like iPhones and particularly laptops that use Wi-Fi require up to 30 minutes before going into "sleep" mode. During this time, burglars detect using a specific scanner which just costs about $50.
A group of people were caught recently for stealing laptops in this fashion. Hence better take some time to turn off your Wi-fi, every time you leave your laptop, iPhone or iPad in your car.
It may look improbable that your automobile will become a target because of an open laptop, please be cautious to switch off the Wi-Fi signal before leaving your vehicle for long periods of time.