No 3G data after jailbreaking iPhone
Did you jailbreak your iPhone only to find that afterward you’ve lost 3G data service and it’s stuck on Edge? Not to worry, because all you need to do to get things back to normal is Reset your iPhone’s Network Settings. To do this open Settings.app then General -> Scroll down and tap Reset -> Reset Network Settings -> and confirm Reset Network Settings. Your iPhone will restart (it may take a few seconds longer than usual), and when it comes back on your 3G data service should be restored.