WordPress for Blackberry is free and other versions are available for other Smartphones notably Android and Iphone
You can create/edit new pages,posts on the fly and then promote using twitter with embedded links to content all from your phone.
Tip Consider a mobile theme for your site a lot of browsing happens on the phone and is increasing at a rapid rate.
Download you can download the app direct from Blackberry World if you have installed or download from link on their site.
FAQs WordPress has Faqs for common issues using the Blackberry App it should help with any immediate issues.
Posted with WordPress for BlackBerry.