I also think it might be a good service. But here is an example of how things can go wrong. The City of Hermosillo instituted a 911 service for foreigners. It was advertised in Tucson. Seemed like a great idea. NOT!! It only works when dialing from a Mexican cell! I tried it one day just to see if it was operating. An operator answered in less than 10 seconds. She spoke zero English. When I asked in Spanish if there was an English speaking operator she replied: " NO HAY", Posible mas tarde.
Moisheh