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.smssecurehttp://silencekeurcyue3.onion/#IranianProtestshttps://twitter.com/atralheaven/status/948288399303168002
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
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