Iphone 4 not calling facetime on cellular deta

Hey khurram4u,

The resource below will help you troubleshoot your issue with using FaceTime over a cellular connection. Click the link for complete details.

If you can't make or receive FaceTime calls - Apple Support
http://support.apple.com/en-us/TS3367

FaceTime over Cellular

• Find out if your carrier supports FaceTime over cellular.
• To enable FaceTime over Cellular, tap Settings > Cellular, then turn Use Cellular Data on for FaceTime.
• If you make changes to your account, you might need to restart your device for the account change to be picked up.

Regards,

Judy