cell phone as a modem?

can I use my cell phone as a modem to get online?
I am not talking about using cingular online service using EDGE network, I am talk about use the cell phone to dial a dialup number to get online like a normal phone.
probably not, just asking.

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The device you want to be able to go online with (i.e., your laptop or PDA)
A data-capable cell phone (i.e., the cell phone should be able to go online on its own).
A data plan for the phone from your wireless provider. Most cellular providers these days require you to have a data plan for your smartphone anyway, but regular (or feature) phones may also be web-capable and therefore can also act as modems for your laptop. You'll need to have a data plan for the phone, whether it's a cell phone or smartphone.
Either no restrictions in your contract for using your phone as a modem, or a separate, additional data plan that allows tethering