Whenever I call somebody, or even answer a call, my phone will never let me hang up. Recently I've noticed that my Galaxy S3 will freeze up when I call. After I am done talking to whomever I was talking to, the screen just blacks out. I can still either hear the person talking, or I leave an uncomfortably long voicemail if they don't pick up. I can only access my phone if they end the call first, then the screen lights up again and I can click the home button. I always pray that the person I'm calling will pick up because if they don't, I have to sit there and wait for the phone to eventually exit the voicemail after an uncomfortably long time.