I'm not convinced on the cell phone thing. Every time there's even a minor thing around where I am, like a dinky little power outage, everybody grabs their cellphone and my service goes to crap, so much so that when I've tried to work through a power outage with my phone, I've worked out of my wife's car after having driven somewhere that does have power.
Also, a standard ham radio uses a lot less power than the entire chain of phone plus network equipment. So, sure, there's cell tower trucks with generators but a ham rig needs a dinky little solar panel.
Sure.... but.... not all municipalities let you text 911. And with the way modern phones are being implemented with VoIP+LTE and iMessage/RCS and some of the very exciting failure modes of modern networking... I'm having a very real concern that even if my municipality lets me text 911 (I don't remember offhand but I think mine does) that if I actually needed to dial 911 under relatively prosaic emergencies like a silly little power outage, I might be out of luck.