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How to call the emergency services in a new way? - emergency call system

How could I do if I am the police with the help of a cell can be without the violent person to know to call?

I can not Skype or something similar, because it uses the voice over Internet protocol, call it a secret.

Can you imagine a path to a system design that around this technical problem?
One possibility, without physically holding the phone to be brought?

FRANK