If you can use a phone as a modem for your laptop does that mean that you don't have...

[Sunshine]

...to have separate service? I was just looking at the Sony Erickson Experia phone and one of the reviews said that you can use it as a modem for your laptop.Does this mean that you don't have to pay for a separate internet service ? My daughter use to connect to the internet through a razor phone she had through at&t and I was wondering if it was the same thing.Thanks.