To clarify I added ""technically" to the question: My immediate goal is finding a way to reach relatives during this blackout. More importantly, how to build a resilient, long-term communication fail-safe so we aren't cut off when we are connected and the next shutdown happens.
and initially last week, maybe some ideas:
Iran Goes Into IPv6 Blackout
https://news.ycombinator.com/item?id=46542683