Some mobile phones can be muted by turning the device over. I have read that this is also supported by Lumia phones but couldn't find the setting in mine -- is this true? If so, where is the setting?
Unfortunately it doesn't look like there's any way to accomplish this in Windows 10 Mobile. Your best option is to use the Windows Feedback app to let Microsoft know you miss this feature. A quick search for "flip" brings up a number of results that you can upvote.
Windows Phone 8.1 supported this functionality, it could be enabled in Settings → Audio, using the "Flip to silence" option.
Alternatively, one could download the Gestures Beta app, which provided several other similar gestures, like automatically toggling loudspeaker mode (individual gestures were dependent on the presence of specific sensors). After installing the app, it could be found in Settings.
For more information, see the following links:
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2Is this perhaps specific to Windows Phone 8? I'm running WP 10 and there is no item "Audio" in my Settings menu. – fuenfundachtzig May 3 '16 at 16:28
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1Ah yes, both of these answers apply to WP8, I didn't know you were running Windows 10. I'll update my answer. – Indrek♦ May 3 '16 at 18:26
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I see somebody else added the WP10 tag (thanks!). I think there is no Lumia 550 with WP8 but I should have added this information to make it clear. – fuenfundachtzig May 3 '16 at 21:22
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Ah, my bad, I didn't notice the Lumia 550 tag. Yes, that model only comes with Windows 10 Mobile. – Indrek♦ May 3 '16 at 21:28