said by Nightfall:I believe the only caveat is that you have to get business TV and phone as well as internet. You can't get residential TV and phone, and then get the business internet at the same address. At least he had that problem when he initially signed up, but that was 3 years ago. Things could have changed on this front.
~3 years ago when I first got Comcast Business Class HSI, I just added the BC HSI to my existing residential TV connection. I actually tried to get Business Class TV service (it was cheaper at the time with a bundle), but I was told that I could not get Business Class TV service unless I had a business that had a waiting room for customers, and/or a canteen/lounge area for employees (my installation is in a home office environment). Of course, like most things that Comcast offers, the rules vary in each franchise.