Favorite Apps for your Smartphone

[CRedskinsRule]

I have a question for iPhone users. Android has an app, called Shush!, which is great for movies or meetings. The gist is when you turn your phone volume to zero Shush! pops up and asks how long to stay quiet. After that it automatically restores your ringer volume to a predefined level. It's a great app to run in the background.

My sister has an iPhone, and complained how she always forgets to turn the ringer back on, so I told her to get this app, but then when I looked for it in iTunes I couldn't find it. I rarely use iTunes though, so I may just not have looked in the right place.

Does iPhone have a similar setting, function or app?