I have Comcast basic cable ($10/month) and a Samsung HDTV, so Comcast says I don't need a box with the type of service I have. I get a nice picture on a limited number of channels. My neighbor has a box, and doesn't watch TV, but pays for the service. He wants to give me his box because he thinks I'll get more channels with it. Is this accurate, or is the number of channels tied to the level of service I pay for?