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Press the volume down key, then choose from either 'none', 'priority' or 'all'.
None will be no sound at all and Priority you can set which things you want to ignore using the little cog wheel menu that pops up when you select Priority.
In priority mode, you need to tap the little cog wheel to get into the options and select the 'calls' and 'messages'. Otherise they'll be silent if turned off.