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Generally speaking, privacy advocates and security researchers [https://ssd.eff.org/en/module/problem-mobile-phones do not recommend] using mobile phones or smartphones for secure communication.
There is a third way however, to communicate 'off the grid' for smartphone users. [http://opengarden.com/ Firechat] uses the phone's wifi or bluetooth device to establish conversations with other users in the geographic vicinity. You do not need to connect to the cellular or data network. Messages between users in these temporal messaging rooms are not, however, encrypted.
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