The biggest problems is power. The phone company power the POTS line — you can even make an emergency call from an abandoned building with no electrical service (and no phone subscription) if you find a jack and plug in. Under those huge central office buildings are huge banks of -48 V batteries which are required to provide a week of power (or was it two in the US? I can’t remember).
Now you’ll have a router with a battery that the owner doesn’t know about and won’t service, so that within a year or so it won’t work. In an emergency: no phone service.
AT&T is using old people to market their new cellular-to-POTS bridge product.
The premise is she needs something as reliable as a landline, because during California wildfires the cell towers and power go down.
Maybe someone should have whispered to her that this product uses the same cell towers, or equally-vulnerable broadband. I could not stop laughing.
> Now you’ll have a router with a battery that the owner doesn’t know about and won’t service
In Canada, Bell has actually discontinued battery backup in their latest modems, supposedly because they were having trouble with modems not rebooting correctly.
How many people still have a corded phone, and how many of those would remember that those phones still work when there's no power?
It's much more important to ensure that the cell network is resilient. Backup power, mobile towers that can be deployed to disaster areas, and continuing the rollout of satellite connectivity will help far more people than maintaining landline infrastructure.
You wont have a battery. In the UK they stopped providing a battery backup when they switched to the newer ONT quite a while ago, and routers typically do not include one either.
There are a few generic router battery backup products on the market but none specifically get advertised as working on the ONT, but many do. Realistically though they're utterly pointless when you can pick up a vastly superior APC UPS for the same price.
This assumes that anyone has maintained the 48V infrastructure, which doesn’t seem like something that will be feasible considering the insignificant quantity of customers using true copper landline service.
The other problem with customers preferring not to have landlines is that by the time they need them, it’s too late to convince them to buy a traditional telephone and plug it in. You are likely to be nursing home age if you still prefer having a landline. You can have amazing infrastructure but if nobody uses it, it’s useless.
What we really have now is cellular sites with their own infrastructure aiming to keep them operational during power outages.
Then we’ve also got various satellite services that are growing in capabilities day by day, and are built in to common devices like iPhones as an SOS method.
I’m not in the UK but my house was built relatively recently and it doesn’t have any telephone jacks. The theoretical benefits of a landline are entirely theoretical. The ship has thoroughly sailed.