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As the title says.

Yes you can as long as the app never gets pulled from the app store. I always make backup's of my itunes library, just to make sure my favorite app doesn't one day disappear.

--fontez
 
Yes you can as long as the app never gets pulled from the app store. I always make backup's of my itunes library, just to make sure my favorite app doesn't one day disappear.

--fontez

I've a few apps on my iPhone that are no longer in the AppStore. Why is it apps disappear? Is it Apple or the App Developers who do this?
 
Yes you can as long as the app never gets pulled from the app store. I always make backup's of my itunes library, just to make sure my favorite app doesn't one day disappear.

--fontez

Actually you can still download some apps that aren't in the appstore anymore, not sure if it's still like that but I remember redownloading iDOS (A Dos emulator that was pulled) when the purchased tab first appeared at the announcement of iOS5.
 
I've a few apps on my iPhone that are no longer in the AppStore. Why is it apps disappear? Is it Apple or the App Developers who do this?
Could be either Apple or developers themselves. Reasons for pulling vary as well: critical bugs, violation of developer guidelines, discontinuation of previous versions due to the release of the next major update, rebranding, etc, etc, etc.
 
Either/or. Sometimes Apple makes a developer pull an app, and sometimes the developer pulls the app by choice (ex. VLC)

Note that VLC is not available for redownloading. It has been completely removed from the iOS Applications Store.
 
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