I like to use custom sounds/ringtones for my incoming text messages. The one I currently have is about twenty seconds long. Anyway, I was at work the other day doing a presentation and I thought I had my phone on vibrate. I did not and received a text message and the ringtone went off. I pushed the volume button down to silence it but it would not. If the phone is in lock mode, is it not possible to silence a message? Thanks.