https://www.bleepingcomputer.com/news/security/signal-calls-on-users-to-run-proxies-for-bypassing-iran-blocks/

Signal is urging its global community to help people in Iran stay connected with each other and the rest of the world by volunteering proxies to bypass the aggressive restrictions imposed by the Iranian regime.

The end-to-end encrypted messaging tool is currently blocked in Iran, along with WhatsApp and Instagram, which many people in the country use to coordinate protests and share information with the rest of the world.