Telematics is two-way wireless communications and global positioning satellite technology combined into a vehicle-mounted or portable unit that provides a user interface to obtain assistance in a variety of situations. Also known as mobile security devices (MSD's), in-vehicle telematics systems can request emergency assistance upon airbag deployment, vehicle rollover, or theft. It can send out a call for help when the driver presses a specially designated emergency button. In preparation for such calls, local agencies should: (1) provide telematics awareness training for dispatch and field personnel; (2) define response parameters to MSD calls for service; (3) establish a means of cost recovery, including charges for false responses; (4) communicate with private call-centers; and (5) just say "NO!" if a private call-center is not responsive to agency needs, gives bad location or incident information, or does not take responsibility for its false dispatches. Police agencies should refuse to respond to MSD's requests until they take proactive measures to address agency concerns or consider a pay-as-you-go system for these calls.