I have set up MP3 ringtones for both incoming calls and text messages on my new Galaxy Nexus, but I can't figure out how to silence them without hanging up (in the case of incoming calls) or without having to wait until the entire sound bite is over? Any suggestions? Does anyone know how to do that? Any help will be greatly appreciated.
When the Galaxy Nexus is ringing...
Tap the power button on the right side of the screen.
The ringtone will stop and the screen will switch off. BUT the call has not been hung up.
You can even press the power button again to switch the screen back on and the ringtone is silent if the call is still waiting to be answered. The voice call will still be at the correct volume when you actually answer it.
Click either up or down volume to silence your phone. This is the user-manual-recommended way. When you click it your screen stays on.
Note: this usually works with any phone, not just Androids. It used to work with old stupid-phones (antonym of smart-phones) as well.
A third option is to enable the setting so you can flip your phone face down when ringing to silence the phone. Under Sound Settings > Phone Call Silence I believe.
Just press power key at the right side of device. It will become silent.