Well, that would not have saved him here in Bucks County, PA. Up here in the north end of the county, there's plenty - I mean PLENTY of places where there's no cell service at all.
In fact, we did a rescue job at Ringing Rocks Park - not to far from us - a woman fell and broke her ankle and her friend tried to call 911, no service at all.
It's not like we're in the Nevada desert here, we're in a semi-rural/low density suburban area, but there's really, really poor coverage.