@CrimethInc Using signal is better than using nothing, but it is not possible to use signal anonymously. The sim card requirement creates a link between your legal identity, your phones mac address, your signal user name, and your approximate physical location. Signal creates a lot of unnecessary meta data that cops can easily cross reference with other data they have access to.
I wish people would stop spreading the fiction that signal is magically gonna keep you safe, it isn't. It's just encryption, nothing more, nothing less.