Help Voice Call issues

[HoLengJai]

A bit of help would be greatly appreciated. Everytime i try to make a call using my s2 it just disconnects. I can receive calls fine but i cannot make them. Whats wrong with me phone?

 

[retrorom]

Have you set up your APN correctly? What carrier are you on?

Here's a list of working settings, let me know if you need assistance http://code.google.com/p/cyanogenmod/wiki/APNlist