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  1.    #1  
    When I use my noise cancelling headphones, I get a humming sound through the ear-pieces as long as the screen of the Centro is illuminated. When the screen shuts off, the noise stops. When you put your finger on the five way navigation button, the noise gets louder. When I shut off the noise cancelling feature on the headphones the noise goes away. I did not have this problem with my Treo 650. Anybody have any ideas what I can do? I have tried two different 2.5mm to 3.5mm adapters thinking that was the problem but it made no difference.
  2. #2 Jabra C820s Noise Canceling Headphones do the same thing.
  3. #3  
    no such noises with Ultimate Ears phones. Good luck tracking this down.

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