passphrase

Hey, I have very basic knowledge about pgp encryption. My question is is i have for example a blackberry phone with pgp encryption sofware on it can the administrator use a passphrase to read all my emails threw the pgp universal server. the aministrator chooses the passphrase then i choose the rest> i dont know the passphrase.. ?  Can they then at a later date use the passphrase they chose and read the emails?

Regards

Crypto