Is there such an animal? I have an app called Blackboard, but my college will only allow the app with a WiFi connection. Is there a Cydia app that will trick other apps to think that they are running on WiFi even when they are not?
My3g or 3G unrestricted both do what you are wanting. Like noted above if you are on iOS 5+ then you will use 3G unrestictor 5. Then you can set what apps you want to use this way. Good luck.