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Some phones like the iPhone currently don't support Cell Broadcast (CB) for receiving and displaying warning messages that inform the user about an imminent emergency situation and provide guidance to safety.
For as long as these phones do not support CB, an alternative solution should be available. The requirements for such a service are described in the following chapters.
The service should work as follows: a notification is pushed to all registered mobile devices. The notification will contain the warning message information, including the location information (a polygon of max 100 points), from the server. The notification will automatically trigger the applet and the applet will check whether the phone's current location is within the emergency target area, based on its current or last know location, and trigger a message in a pop-up which will display the warning message (including the target area), together with an audible alert. The pop-up will disappear...
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