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You can send encrypted SMS messages even if the Internet is censored, but beware of metadata and GSM tracking! If you can't access to the Play Store, Silence is also available on F-Droid: https://f-droid.org/app/org.smssecure.smssecure
http://silencekeurcyue3.onion/
#IranianProtests
https://twitter.com/atralheaven/status/948288399303168002
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
reminds me of TextSecure back in the day. I mean Signal is cool and what not, but i was disappointed when they removed SMS support