E398 GPRS

Hi..

I'm a bit of a newb to some of this mobile stuff..I've got a modded E398, and I was wondering, as the GPRS services in my country are between pricey and extreme(and theres only 2 of them)

(Please note, as of yet, I have no idea how GPRS works)

Is there any way, to set up a device, attached to my computer, that my cellphone can work with, in a say, 5km range, to give my phone net access?

I was thinking there might be some sort of way to set up my computer as its own mini gprs provider, and set my phone to it, like a private GPRS network..is that even possible?

yet again, apologies if this is in the wrong place..hell I think it might even be the wrong forums, but I cant find anyone to put it into simple terms for me lol, and you guys seem to know quite alot about mobile phones