This paper demonstrates that contemporary smartphones act as effective message\r\nfiltering systems in high traffic environments such as emergency response\r\norganisations, without relying on central servers. We have prototyped a mobile\r\nmessaging application for Android smartphones in the Erlang language. We\r\nimplemented filtering rules based on message origin, importance, and temporal\r\nvalidity, and tested the filtering capabilities of a smartphone in a realistic setup, that\r\nsimulates traffic of tens of thousands of messages per minute, as in a large scale\r\nemergency response operation. The conclusion is that careful coding of the\r\nmessaging application so that it operates in constant memory space and judicious\r\nuse of the available display area can provide an effective portable message filtering\r\nfor real-time, high-volume traffic, and the potential to reduce information overload\r\nfor the emergency responder.
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