I am following the Xfactor http://xfactor.itv.com/2009/ at the moment and the key phase that keeps coming up is the importance of believing in yourself Stacey Solomon was told that she needs to start believing that she is of star quality as she delivers her current great performances. May be if they change the type of songs she sings, it will give her greater flexibility in her performance and help reinforce her belief.
Can you see the parallel with your phone work and your belief in whether your calls will get you the outcomes you want? If you not getting them, change what you are doing so you do. Then notice how your belief changes and how you really get into the zone when you are calling!!