If you are looking for independence from the major carriers, one expert says to consider UHF data radio as an alternative.
For some time now I have been writing and presenting at various venues on what the monitoring industry should do about the rapid decline of POTS. I have explored the use of VoIP and cellular and have spoken of a new LTE cellular network called FirstNet, to be used mainly by first responders. This article is dedicated to those who wish to be totally independent of any network controlled by an outside entity.
The answer might be to set up your own network using a 450 MHz UHF Radio system.