Our friends at unvired have a great native BlackBerry client for MantisBT that works out of the box with our MantisBT hosting package.
With the unvired client you can access all project and bug information including attachments. Seamless offline viewing and data refresh. Works even without internet connectivity and will sync automatically whenever connectivity is detected. Fantastic UI with easily accessible dashboards and information at the click of a button.
Our MantisBT hosting plan is pre-configured to work with the BlackBerry client, no additional configuration required.