US Carriers used to have this and they may still. I have definitely seen signs to call 77 for roadside assistance. I also remember some radio station having a

US Carriers used to have this and they may still. I have definitely seen signs to call 77 for roadside assistance. I also remember some radio station having a code(star number?) that related. To their frequency. Edit: Here is a list of emergency numbers. 77 and *999 are on the list for different states. http://www.ou.edu/police/dpsinfo/state-by-state-cellphone-highway-emergency-assistance-numbers.html http://www.ou.edu/police/dpsinfo/state-by-state-cellphone-hi...