According to RIM, DST patches for BlackBerry handhelds running versions older than 3.6 will not be released.  They suggest contacting the CARRIER for a suggested upgrade path.

Patches have been released for BlackBerry devices running v3.8 or newer.  The pre-3.8 versions listed below are targeted for release by RIM in the near future:

Application	Platform
3.6.0.38	1.4.0.38
3.6.0.51	1.4.0.54
3.6.1.21	1.2.0.61
3.6.1.25	1.2.0.63
3.6.1.42	1.3.0.23
3.6.1.42	1.3.0.24
3.6.1.46	1.3.0.28
3.7.0.62	1.6.0.91

To see all available patches for software versions that have been released, go to  http://www.blackberry.com/select/dst2007/resolutions/patched.shtml.

NOTE: To locate version information on your BlackBerry mobile device, click ‘About’ in the device options menu.