I think if the customer shows that he is only dialing one or two numbers, Vonage would "believe" he is using it for personal use.

I don't blame Vonage for this one, they are trying to get businesses from using a personal plan. I personally think 100 minutes a day, every single day, is a lot of use. Not many "loved ones", even separated by an ocean, would want to talk that long to each other, day in and day out.

This sort of reminds me of a case in Canada years ago when their land lines went to "unlimited" use and they flagged this guy that called his girlfriend for 4 to 6 hours per day, every single day. In an interview, when asked how can you talk that long on the phone, the guy literally said that sometimes they just put the phone on speaker to "hear each other breathe" or to "watch a movie together and hear each other".