Now, almost everyone would have jailbroken their iDevices on iOS 4.1. We have greenpois0n ( Mac, Windows and Linux ) , limera1n ( Mac and Windows ) and PwnageTool ( Mac ). We also have redsn0w (Mac and Windows) for iPhone 3G and iPod Touch 2G running iOS 4.1. But some of you can’t activate FaceTime and get no cellular data connection. Read on for the solution.

No cellular data connection fix :

1) Check if you have cellular data connection.

2) If not, load Settings.app and see if the iPhone sees your correct carrier.

3) Assuming that it does , go to Settings >> General >> About >> Check the carrier . If you bought your iPhone say from the US, after unlocking your phone, it will not choose your carrier’s bundle, but the AT&T carrier.


FaceTime Fix :
 
1) Load Cydia and add the following source: cydia.pushfix.info

2) Install ‘Carrier Reset fix’

3) Eject the SIM after installation and re-insert it

4) Go to Settings >> General >> About >> Now your iPhone should see the correct bundle.

5) Enjoy your cellular data, and if FaceTime was ON and waiting for activation, you will probably receive a pop-up saying ‘hey I’m about to send this international message’ . If not, go to Settings >> Phone >> Turn FaceTime ON. In a few seconds it will be activated.

Note : If the FaceTime ON/OFF slider is not there, installing this patch will bring it back. If not, you might want to insert the original AT&T activation SIM , sync your iPhone with iTunes, and reboot. Now the slider will be back, and you can insert your own SIM.