CrashDetech uses data to upload your trips to the cloud. The default setting is to only upload completed trips when connected to Wi-Fi, which means, unless you change this setting you will not incur data charges during each trip.
In the case of an emergency the only way for CrashDetech to alert our medically trained call centre and share your exact location with our agents is by sending a data message from your mobile. It is of utmost importance that you have available data on your phone.
CrashDetech are working on a solution for the future which will send an SMS notification of your emergency if you have no data available.