Comment Re: It is the single most reliable piece of tech (Score 2) 449
For POTS, the telephone is at a fixed location (obviously close to the accident in the parent's example), therefore, in an emergency, the person is more likely to be trying to get help for an emergency which happened near or at that location.
Those with POTS are not calling to tell someone that they are going to be late coming home, because they already are home.
In contrast, mobile phone users near such an accident trigger many calls unrelated to reporting the accident (telling someone they are running late) and overload the cell network.
Most people living close enough to such an accident are not home, are not directly affected by the accident or are simply unaware of the emergency, and don't or can't call, therefore, the POTS will generally not overload (although you may overload the number of 911 or 112 operators).
Therefore, for an emergency covering a small area, POTS will almost always be better.
For emergencies covering a larger area that might overload the POTS system (8.5 earthquake, a hurricane or such), you have other problems anyway.