Ok, I have a cheap phone plan in which the internet access is not unlimited on my cell phone. However I set my n800 to connect through bluetooth to get network access anyway, and I paid for it on my bill. I use the below setup...

Connection name: GPRS
Connection type: (select, Package data")

Access point name: wap.cingular
Dial-up number: *99#
User name: WAP@CINGULARGPRS.COM
password: CINGULAR1


But I do have unlimited phone calls....
Now, I also have an old Dail-up account I never got rid of once I switch to DSL and it's still active (onwire.net). So is there a way to set up the n800 to CALL this access number just like old school dial-up.

Nope. Your unlimited voice call plan will almost certainly not contain unlimited data calls, and due to the data reduction on voice channels, passing data over a voice connection is only possible within so severe limits that it is practically impossible to tunnel TCP/IP traffic over it.

ok, so on the same type of situation, i have a blackberry, with unlimited data connection on it, i'll be getting my n800 soon. So, needless to say, will it cost me extra on my plan to use it as a bluetooth modem?

Here is somebody claiming to get 9600 baud out of their cell phone via dial-up.

http://www.velocityreviews.com/forum...cellphone.html

That is data dial-up, where the phone connects via a modem residing at a data center of the network operator - which is generally billed separately (or even blocked) in flat-rate plans.

FWIW, back in '97/'98 I used dial-up through my cellphone to work, where we had a phone number attached to an old-fashioned modem. Worked just fine, for non-interactive work, and even compressed interactive SSH. I used this from another country most of the time. It was totally useless with my Windows laptop though, because if the GSM phone cut the connection Windows would disconnect the TCP/IP networking and all was lost. So I installed Linux on the laptop and all was fine (when I had to leave the premises I just turned off the cellphone and let the transfer stay connected, put the laptop to sleep, the day after I woke up the laptop and re-dialled the connection through the cellphone. Transfer continued.)

This worked fine for remote CVS through SSH tunnels and the like. And email. And the occasional interactive SSH login. But you need that modem connected to a phone at your endpoint. Some of those free (or cheap) dial-up internet services still exist.