There was a back and forth dialogue between the neo900(uber geeky community full hardware upgrade for the amazing Maemo linux N900 phone) team and Richard Stallman over at talk.maemo.org on including a plug in POCSAG pager circuit for the prototyping port and having an app that could call back numbers paged to you when you desired. It turned a mobile phone into an untrackable passive receiver until you were ready to activate the GSM system and make an outgoing call. The exchange got bogged down in discussing the firmware upgradeability of the modem chip module but it was interesting that RMS was actually showing interest in finally owning a mobile phone.
It might be inconvenient forcing all incoming calls to hit voicemail first, but especially at protests and the like it breaks the utility of these police state gadgets.
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