Acer E110 - Manual (Page 26)

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Muting a call
To mute a call, tap Menu, then tap Mute on the voice call
screen to switch off the microphone. Tap Mute again to switch
the microphone back on.
Saving a dialed or received call number
to contacts
You can save a number you have dialed to your contacts for
future use.
1. Select the number from the Call log tab, and tap Add to
contacts.
2. Tap Create new contact and select how to complete the
action. Please refer to “Adding a contact“ on page 45.