Signal has recently reported that their service has been blocked in Iran. This block is a direct attack on the secure communication of activists.

In solidarity with the team at Signal we would like to amplify their call for volunteers to help run proxy servers to ensure that protesters have the ability to send and receive secure encrypted messages.

If you are willing to help, Signal has provided step-by-step instructions on their blog here: https://signal.org/blog/run-a-proxy/