I called Bell and they had no idea about this password,they told me I'd have to contact BlackBerry, so after much aggravation, I got her to contact BB tech support to find out. She then disconnected my phone call, so the guy from BB actually called me back directly! I am mega-impressed. Anyway he told me that this comes from the carrier, not them, and first the feature has to be enabled on your account. Then the carrier will give you the password.
I called Bell Tech Support again, and after no luck with another agent, I asked to speak with a supervisor. He informed me that Bell's network does not support this feature, and BB depends on the network for these features to work or you cannot enable or use the feature. This is unlike iOS or Android where the feature is device-, not network-specific.