In my opinion, cell phones suffer from poor quality regardless of carrier or handset manufacturer. My employer provides one, so I have one. I never use it while driving (convertible + manual transmission + safety = no talking on cell phone) and if I am near a wired phone I will always ask to call people right back instead of having a lengthy discussion on a cell.

I have never spoken to someone on a cell phone where I didn't know that they were on a cell phone after they spoke their first sentence even when the person is standing still. The poor quality of cell phones is the service "cost" of using them versus the "benefit" of convenience. It seems that most people believe that the benefit outweighs the cost so much that they are willing to spend their own money for crappy cell service.

I firmly believe that if cell phones hadn't been invented and decision-makers were looking at VoIP for the first time that the person giving the demo would be laughed out of the board room.