Wirelessly posted (8820)
If it is on BES, you need to talk to IT or BES admin.
If it's a used blackberry that has a IT policy from a previous user, you can do something. See blackberryfaq.com (or look for the sticky at the top of one of the forums). Maybe somone will post a link in the meantime. But, what you want to do is overwrite or remove the policy, assuming the blackberry is not on BES.
Fyi, password is a good idea, for a number of reasons.
EDIT here's the link:
http://www.blackberryfaq.com/index.php/Remove_IT_Policy