The technology aint that simple brotha! Actually I think there is an FCC mandate that is going into effect that EVERY mobile phone sold in the US must support this. GSM has been doing this for years and that's why they have that service in europe. The problem with having it in the US is all the different standards, all the different networks, and infrastructures, etc that made implementing this a very complicated process. So maybe I should correct myself that the technology itself is not as complicated as the implementation part. Actually a lot of the new phones now come with GPS built in so that makes things even easier to locate devices that can't be triangulated. Another point to keep in mind in addition to technical/implementation challenges is security and privacy. Anytime a topic like this comes up, a lot of people get very very nervous. So that just adds to the complications. By the way, I hate to bring this up, but if they are using signal strength for ranging, then they are trilaterating and NOT triangulating.