[mdesq]

"In the Off position it does absolutely nothing, allowing you to use your iOS device as usual, but twist it into the On position and it mutes all sounds coming from the device apart from alarms you have set manually."

Those sound like exceptions to me.

[mprovost]

With those exceptions it wouldn't have prevented something like this famous example:

http://www.nytimes.com/2012/01/13/nyregion/ringing-finally-s...

[danhixon]

Misleading headline! Alert the media! ... see what I did there?