Maybe the brain is controlled by the mysterious rays said to emante from the devices: they make you talk loudly, ignore those around you, stand in their way ... ...
I think calls from a mobile should be answered in the same way as a call from Nature. By locking oneself in a small room where no-one can see or hear you.
Maybe we can use the new "memristor" devices announced today by HP to answer the call quietly, in place of the human owner?