Abstract: Mobile device emergency service techniques are described. In embodiments, a client device includes one or more modules implemented at least partially in hardware and configured to implement an emergency service. The emergency service configured to support operations including generating a user interface for display on a display device, receiving one or more inputs usable to form an emergency contacts list that includes a plurality of emergency contacts, and causing the emergency contacts list to be communicated to one or more other client devices for use in generating a message to be communicated automatically and without user intervention to the emergency contacts in the emergency contacts list responsive to a trigger.