I personally don't provide a nest thermostat, but I do provide a ring doorbell.

Ring Central is excellent.

For example on an individual unit level: when were dryer vents cleaned, toilet wax rings replaced, drains unclogged. 

New wax ring, place toilet, tighten bolts and attach supply line... done in less than 5 minutes.

Home ownership is the American dream so when you advertise “Own your own home, $3000 down, bad low monthly payments – Bad credit OK, call Boca Vista Mobile Home Park” Your phone will ring off the hook, trust me.

If someone bought a city block in Dayton and retired early my market will be flooded with investors and my phone will ring off the hook. 

This is a technology that I am looking to use in my business and it simply is this: "Sending voicemail to someone without their phone ringing"  This could be a good strategy as I would be able to send multiple voicemails to people (Cash Buyers or Motivated Sellers) at the same time.I am looking for a legit Software or site that is the best at this technology.  

I always put at the beginning of my listings - TEXT ONLY, NO CALLS, but alas, that number rings constantly. 

I could put up 5 we buy houses signs and be lucky to get 1 call all weekend.If I put up 5 signs that say " Cheap Shell or House 10k"My phone rings off the hook.

Ring Flood Camera.