I jailbroke and unlocked my iphone 3GS using redsn0w yesterday for a friend to borrow who'd be using a virgin sim and at first seemed fine, but as soon he stepped out the house and lost wifi, no internet!
i had to upgrade my baseband when jailbreaking to ipad baseband, if that would be an issue? He's able to make calls and texts and everything it's just the internet! 
Any help would be very much appreciated!
Any help would be very much appreciated!