Only certain adapters work for the Pearl.
I'm not positive, but I beleive it has to have the three little rubber rings on the plug that goes into your Pearl.
Have a look at this thread. They talk about ones that work for the Pearl. http://www.blackberryforums.com/gene...?highlight=aux
Here are links to the Seidio ones that work. 3 Different ones. http://www.blackberryforums.com/gene...seidio+adapter
Sometimes it's a good idea to search before asking. It can save a lot of time and it works great. It is located towards the top of the page.
Hope this helps and let us know how it goes.