The FCC commissioner says half of 911 calls are pocket dials. That would mean that approximately 84 million 911 calls a year are pocket dials. The real question is why are phones doing this and what apps are enabling this?
I think the bigger problem frankly is many of these calls are also attempted in dead zones or areas where cell phone reception is not available. The FCC has address this issue over the years but has not been very transparent on the issue. Read more.
