A.S.
Try making a game out of it. Get her a phone that she can make calls on and have her help you out with daddy helping keep her only on her phone. I know it promotes her using the phone at an early age but she might get comfortable with you beeing on the phone by doing this.
Also create a certain time of the day where its all about her and then create a certain time just for business calls. By keeping to this schedule she should get use to it and be an angel.
Good luck I hope you find something that works.