What you say makes good sense. I typically run on WiFi at home with Mobile Network off. I still receive calls and SMS even when I leave the house. I figure it saves the battery not having to hunt for a Mobile Network signal.
About 2 months ago, I got a Verizon phone survey after discussing my bill. It asked on a scale of 1 to 5 if I would recommend Verizon to others. I said "2". To my surprise,at the end of the survey, it asked me to explain my low score on that question. I said I live in a "strong" 4G area, yet I can't get 4G in or outside my house, yet do get it at the end of my block.
Again to my surprise, I got a call from Verizon the next day asking for more information about my reception issues. The rep said she'd open a case and I may get future calls to further troubleshoot my problem. I didn't expect much, and never received another call. I did start monitoring my signal strength and "time without signal" just to get a baseline and see if it ever changed. I noticed I would never get below 2% time without signal, often higher.
After switching to Revision A 5 days ago, I've yet to see ANY time without signal. It could be Verizon made a change that affected my reception exactly at the same time I switched to Revision A. But whatever the reason, I'll take it!