He needs to change his number and only give his new one to his daughter. There is no reason whatsoever for her to need to contact him. If she needs to get in touch regarding the divorce, property or anything they shared while they were married, she can do that through a lawyer. <br />
She still has a hold of him even though they are separated. He needs to bring out the new 'won't take any **** anymore' new him and she'll soon **** off.
MysticEyes just answered your question perfectly. As a divorced husband I could not have answered it any better. He must, however, stick to his guns and only give the new number to his daughter and let other things work there way out in court. Ultimately, that is where it will be resolved anyway no matter how much *** kissing he does with his ex! Tell her to F/O!