Doesn’t seem especially practical, but I thought folks here might be interested in this method. With the increasing scarcity of pay phones I suspect it might be equally as “easy” to get a burner cell phone with cash and register a signal account that way.
Kind of ironic that an article about anonymity wanted me to provide my email address and remove anonymity in order to read it.
And relies on using a payphone! No offense to OP, but this article is utter garbage.