Hold Blackberry button doesn't oppen application switcher
 

I have the bold 9000. My two friends have the same phone. When they hold the blackbery button for a couple seconds it brings up the application switcher, but on mine it does not. We all have version 4.6.0.xxx. How can I enable this feature?

It depends on what the xxx is on each of your 4.6.0.xxx's. At some point after your OS version, this new feature was added.

You would have to upgrade your OS to, at minimum, the lowest version that introduced this feature. If your xxx is the lowest of yourself and your two friends, that would confirm it for the most part.