Expensive little toys 
I get that from the power company at the cottage. In the city almost never happens to loose power.
Yes they’re marked up a lot for retail 
I definitely didn’t pay those prices, but I move hundreds at a time in my business. Multiple government agencies use them on FirstNet (AT&T) with private APN’s
Sweet!
Alerts via their server if connection is lost. You will also need a hub.
Of course if your internet goes down, it will probably tell you that the power is out (if you’re not in the house, but if you are then you’d already know if it is out).
That’s why having battery backup on the Internet/router is nice
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Absolutely, mine can run it for about 8 hours, but we’ve never had any outage that long. But if the ISP goes down or router locks up etc, it will still alert you as though it was a power outage. Not really any way to differentiate.
No different than my router rebooter at the cottage. If the power goes out I get notified that it is offline and if the internet goes down, same message. The only true monitoring would be via cell connection on battery backup device.
I love your solar battery setup from older posts.
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Assuming Rogers’ tower has a generator 
Oh, you’ve got a small battery…
That’s 3600 Amp Hours at 48 volts (or a little over 170 KWH).
No, not at home
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I was referring to cell providers in general 
EDIT: BTW, I always have cell signal whenever there is power outage 
Most cell towers in my area have a power backup system that are both battery and generator.
I think @dave27 was just throwing a jab at my ISP at the cottage.
Battery (a few hours max), but generator? Hardly any around here have generators.
The ones in frequent power outage zones (PG&E) if the wind blows and fire hazards it’s a Public Safety Power Shutdown, then in the winter down trees and snow storms take it out sometimes for weeks.
One winter we did lose connection for a few days after close to two weeks without power, propane likely was unable to be delivered due to the amount of snow needing cleared.
Also AT&T runs the FCC created First Responder network called FirstNet which is used for public safety so keeping them up is a necessity.
I have multiple data accounts on FirstNet and regular AT&T data plans for my data connections both work@home and home usage.
One of my other lives is a communications reserve with the California Governor’s Office of Emergency Services. Several of our people are in areas subjected to Public Safety Power Shutdowns. One of the guys last year did a detailed report on what did and what did not work and for how long on a couple of the PSPS events he was subjected to. His AT&T FirstNet phone lasted (doing this by memory) something like 16 hours and the Verizon phone was about 6 hours. One of the carriers (don’t remember which) was able to get a portable generator to a site that gave a weak signal after a day or so.
If I can find it (I think I kept it), I will post corrected numbers.
Yes, the carriers would like you to believe that they have emergency power, but most cell sites have a few hours of battery at most - and that includes FirstNet sites.
Go back a decade and most cell sites did not even have battery backup…
BTW, a decade or so ago, Southern California Edison made a petition to the Public Utilities Commission requesting to abandon their 2-way radio system because they could just use cellphones. In one of their brighter moves, the PUC essentially told SCE, not just NO, but HELL NO. The PUC realized that the very people who needed to communicate in order to restore electric service would be dependent on the cellular system that had no power and in most case, limited or no backup power to keep their cell sites up. Note that I’m biased - I ran the SCE 2-way radio system for many years before changing jobs.