Wirelessly posted (HTC Diamond: Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 7.11) Sprint MP6950SP)
Are you using a headset/earphones?
If so then the push button on your earphones/headset may get pressed or may malfunction so it thinks it was pressed and then your phone starts dialing your last called number.
Try to disable or change the behavior of the button.
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Trombone players do it in 7 positions!
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