Sorry,
Just realized I didn’t actually answer the original question.
There is no such thing as "High speed dial-up". What many have already said is kind of true. They install a little program that is “cache” like(cache implies it empties at shut down), but more like a temp Internet folder that never empties. Also, I would bet good money that anytime you are online, the provider is logging your Internet surfing and selling the info to anyone that wants it! Reminds me of MS!
Personally, I call this a virus! Avoid it at all costs!!