Great question. I'm no expert, still a newbie when it comes the blackberry, but this is what I understand.
The mute button is for when you are receiving a phone call, alerts, etc. When you receive them, you quickly hit it and it will shut off those sounds in the moment. This is what I did when receiving a call once speaking with a Home Depot rep (and might I add, a really foolish ringtone I soon changed after).
It's not like an auto-profile changer that puts your phone on silent mode.
If you want to change your profile, on the main screen you just scroll your trackball right and change the profile (or speaker) to a different setting. Hit menu button when choosing your profile options and you can change settings for each one. My suggestion is to do 1 of two things.
1. Simple one: always keep your phone on vibrate.
2. Change your normal profile so that when it is in the leather holster that comes with the phone (one with the magnet in it), it vibrates only for everything when in holster, and different when out. Keep it in the holster when in class and you're good to go.
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