Wirelessly posted (Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3) Anyone else having issues activating Siri by holding the phone up to your face? Mine rarily works in this manner. I have no issues by holding down the home button. I'd imagine this is activated by the proximity sensor. Thanks!