"I've seen cables that connect to the power in of the cel phone and have a USB connection on the other end of the cable."

I have such a cable. It charges my phone and it's a great thing. It wieghs almost nothing and I leave the charger at home.

"How can I use my cel phone to dial into my current Internet Provider connected by this cable to my laptop, or dial into the Internet Provider through my laptop to the cel phone.

I'm trying to find a way to use the cel to connect to my Internet Provider without having to subscribe to another Internet Provider such as T-Mobile or Verizon."

Ahh, you'll have to get your cell phone guy (watch the movie "Cable Guy") to show you how to do that with their network. Its far from automatic and rarely cheap.

Bob