Ring doorbell and a cellular wifi device.

Apparently cellular carriers all came together to form a barrier for Mass  Text marketers

The base unit as a sim card in it that works on cellular.

The cellular backup plus 3 gigs of usage is a game-changer.

Plus, what if they forget to install the app in advance and when they arrive there is no cellular signal?

I am considering adding this to services offered to clients, out of area and local, these properties are vacant, and no utilities.I am thinking of purchasing a system, putting it in, and removing it once property is rented/sold.I’ve seen stand alone solar cameras with cellular, im researching cost, and I want to provide access to owner if they wish to view the property remotely. 

I 2nd what @James Wise said, but if I were going to do it (and I was not working with load bearing walls, I would focus on the back area and hall.It really comes down to what our close in competition is getting and what their offerings are.If you see a more tidy, rain protected look getting more money without sitting on the market too long, or you don't want to offer something too downscale (looking for a little better renter--hopefully)....maybe focus on the hall and back door.Some of the things I see that can could the possible rent a little better might be, door types, a rain roof, concrete patio and trash areas, a cellular door bell on the bottom, an outdoor modern looking pigtail florescent light (day lighter), the interior hall with commercial tread covers and lighting like the sun (day lighter) as well as a sturdy metal handrail or two, and a window at the top.But as James said above--beware of spending when you don't have to (but that's your call depending on your close in competition).Good Luck!

Hello,I've read several posts related to cellular tower leases and there's a site that gives you the ranges ($350-$4,000) of monthly leases.

The meters have transceivers attached to their pulse output and they communicate wit a gateway that is connected to the internet through Wifi, Ethernet, or even through a cellular data connection (if no internet service is available).

One thing to keep in mind is that Canary (or Piper, which provides a similar product) requires WIFI/Internet, whereas Simplisafe uses a cellular connection.