Ramsey,
More:
The Rachio 3 is a very neat unit, I am very happy with operation, and performance overall. I have two Units installed, simply because existing wiring for the the front and back gardens were set up separately by the previous owners.
However I did run into a problem establishing the WiFi Connection.
A known Rachio 3 problem, but not at the time I struggled with it.
The issue is that modern iPhones and Andriod phones use the WiFi chip in a manner that Rachio 3 does not comprehend. So the Rachio WiFi Connection configurator just drops out at the last moment.
Finally, in desperation, after many to’s and fro’s with Rachio, I tried my wife’s iPhone 6, and surprise, found it was compatible, and completed the setup, smooth as.
(my iPhone 11Pro does not work, and still does not work, no Rachio firmware update yet?)
And no, I have not messed about at all with the Rachio 3 “900Mhz” band.
My understanding is that it does not transmit unless it is configured for and detects the Rachio Water Flow Meter.
Robert.