Thanks to hurricane Matthew, I just spent 36 hours with no power, no phone, no cable, no internet.
I hope this is all you suffered and made it through okay.
Yet channel 1 FRS/GMRS was busy with neighbor gabbing about the wait for these utilities. Sure, the cellular worked, but not well enough for voice and streaming data services. I could barely make out a phone call with a neighbor next door and the data services were slow and overloaded. So dont count on these apps replacing FRS or GMRS.
That's the biggest issue with relying on common carrier networks. Overload. Even if the sky is blue and sun is shining, if too many folks are in a given sector/cell and the backhaul is a narrow pipe, you're screwed.
Was in a venue in the southern part of my county (which is fairly rural despite being only 20 miles from downtown Atlanta) working an event last weekend. We saw about 8-10,000 folks a day. Guess what didn't work well, cellular. None of the cartels had COW's because the event promoter didn't think about that.
All the major carriers cell sites in the area are designed for low density use (figure only a couple thousand subs passing through a day and a few hundred in the area) and those sites quickly became choked and could not handle even basic voice traffic because everyone is trying to use HSD and get on FaceBook, Twitter, etc.
Needless to say our Astro 25 7.14 system worked fine and handled the additional load of event traffic, and those folks at the event had no problem using the on-site MotoTRBO radios they rented, and many of the attendees were using FRS/GMRS and had no issues.
Don't throw the baby out with the bath water just yet.