I have friends who live in Cupertino, and when an ISP like Comcast goes down in one or two neighborhoods for maintenance, the cell network (not even Comcast but

I have friends who live in Cupertino, and when an ISP like Comcast goes down in one or two neighborhoods for maintenance, the cell network (not even Comcast but like AT&T and such) also effectively goes down because everybody and their mother starts tethering or otherwise using their phone data significantly more than normal.