Model # D1660
You may download a copy of the manual at http://www.uniden.com/content/ebiz/uniden/resources/ownersmanuals/D1680om.pdf
If the phone is in silent mode, see "Silent Mode" beginning on page 10. If the handset volume is turned down, press up-arrow while in standby mode. If the base volume is turned down, press "+" while in standby mode.
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