applicationWillTerminate when is it called and when not

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In short, unless you have UIApplicationExitsOnSuspend in your Info.plist set to YES, in iOS4 and above there is no guarantee that applicationWillTerminate: will ever get called.

As the documentation says:

For applications that support background execution, this method is
generally not called when the user quits the application because the
application simply moves to the background in that case. However, this
method may be called in situations where the application is running in
the background (not suspended) and the system needs to terminate it
for some reason

(Emphasis mine.)

If you need to do something before the app exits you need to do it in applicationDidEnterBackground:. There is no way to catch SIGKILL.

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