[Yosemitest]

The reason I decided to drop AT&T was a storm that blew down some trees that uprooted their phone lines a couple of miles up the road.
It took AT&T a little over two weeks to fix the line and return our phone service and internet service to operating condition.
My dad's in his mid 80s and that's too long to be without a phone, in case he needs medical attention.

[ConservativeMind]

This is a router that had the dual WAN option with link aggregation or failover—you configure it.

https://dongknows.com/asus-rt-ac88u-review/

I have the ASUS RT-AC3100, which is the four port version (a bit cheaper), but it has the same functionality, otherwise.

The reviewer at that link set his AC88u for aggregation of both DSL and Cable Internet drops. Seems elated after several years.

[ImJustAnotherOkie]

Cell Phone?