Wirelessly posted (Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) BlackBerry8100/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
In a call press the op button. I've yet to have a problem with it getting "stuck" though. When I end a call, its always automatically disabled speaker for me