Deleting Phonebook

[rmac]

I am a relatively new 135i owner. I recently bought my '09 from my step daughter who bought it new. Everything is great and I enjoy driving it. I am having one issue though with the phonebook. My daughter has a multitude of people in the thing, but I can't find a way to removed them. There is a "delete phonebook" command, but when I issue it, it says "phonebook is empty" and it clearly isn't.

Does anyone know if there is some trick to clearing that out, or am I miss understanding?

Thanks,
bob