There was a Netflix movie last year or so about an attack on the US where people outside NYC was meandering aimlessly trying to get Internet signal in their pho

There was a Netflix movie last year or so about an attack on the US where people outside NYC was meandering aimlessly trying to get Internet signal in their phones while NYC appeared to be under attack I they where lost without their phones. Are people that dense? All military radios support AM radio waveform I would not purchase a vehicle without AM radio support.