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go into cydia and type in: MyWi
install it and restart ur phone. look for the app called MyWi and turn on the tethering...ur iphone will now act like a wireless modem

its a battery drainer though. you do not need a 3G network, my iPhone is unlocked and doesnt have the data plan and MyWi works perfectly. BUT!! it will charge you if you dont have a data plan. I learned out the hard way
REP!!
Oh and if you want the free version of it add this source: sinfuliphonerepo.com
Have fun