Placing a call through the cel system from a moving car is the best way to avoid anyone locating me. Sure, someone decked into the phone system might be able to figure out I’m heading north on Highway 5 near such-and-such exit. But with the morning rush-hour traffic starting to build around me, I figure the resolution of any locator circuit in the phone won’t be good enough to select one car from many. (Frag, I wish I’d thought of this last night ...)