The main issue is that even though you can download and install the SlingPlayer Mobile application on the BlackBerry Storm 9500 Mobile device, it might not work properly. This specific device is not included on the supported Mobile devices list and we do not know if it will be included any time soon.
Here's our SlingPlayer Mobile for Blackberry support page.
And you may also be interested in our Enhancement Request community, where you can post your suggestion for the support of this particular device.
The Slingbox Answers Forum Moderation Team