What is Hilary Duff's actual cellphone number or address to send mail?

Now, I've seen a lot of sites that claim to reveal the actual cellphone number of Hilary Duff, however, I don't believe them. I'd like to know what it actually is, I believe hearing her voice will bring me closer to finding inner peace within myself. I've also seen different addresses where to send her fan mail. What is her actual address to send fan mail?