Can this be done. It seems to have installed a Standard modem on my notebook but if i setup a dialup type network connection it does not work through the device although something seems to be happening. It beeps when it try to dial.

Although I haven't used my 7510 as a modem, previously we did use an i90 in my org. as a modem. Nextel charges $10 extra for access and you have to provide your own ISP (assuming you want your computer to connect to the web via the phone).
Hope this helps.

Mike