First of all your phone has to be capable of acting as a modem. Not only that but you will need some way to connect your computer to the phone (Cable, bluetooth) and then it would depend on the phone and computer as to how you would set it up. You should probably get some more info to get a more direct answer. Be aware though most cell phone providers are very much against your proposition unless set up with them in advance. Most providers will cut off your service if they monitor your internet usage over a certain limit.

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What you are looking to do is called "tethering" There are several products available for making this happen. First and foremost though you should contact you cell provider and find out if you CAN do this with your current plan, and if they have a solution to make this happen.
Good Luck!
-Flame
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hi dear friend, first ur cell hv 2 b capable of acting like a modem as synbians cell phones.
2nd have 2 pc suite for cable connection or wireless connection(blut00th)
3rd data cable else bluetooth for making connection beetween pc n cel
after ur device has been found den in pc suiet u hd gprs r something click on it
do the settings as compaired to ur service provider n connect it ur cel acting like a modem.
thanking you,
.........vinu