I switched over from a TMO My Touch Android Phone and I was able to lower the volume using volume keys on side of the phone and I was able to make the Sound Silent and then there was Vibrate mode right after Silent. On my D2, it goes from very low sound straight to Vibrate when using the Volume Keys. Noticed that going thru Settings- Sound- There's an option to Silent the RingTone. I'm guessing that's the only way to completey silenced ur volume on D2. I rarely use Silent mode except for when I'm in meetings or at the movie theatre. It's kind of annoying to have to navigate through the Settings option to enable that option.