Aye. There's no need for anything special. The numbers aren't handed out until the phone is registered which means nothing but punching a few buttons. It can be completely anonymous. The only thing I'd worry about is adding another level of security so wrong numbers don't set off the bomb ahead of time. One of our employees used these things for quite a while and he was always getting wrong numbers, often in wrong languages.  I assume they have high phone-number-churn.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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