With signal can you join public/private channels without disclosing your phone number? The last time I checked (a few years back) I only saw private groups and

With signal can you join public/private channels without disclosing your phone number? The last time I checked (a few years back) I only saw private groups and no way to hide phone numbers. If that is still the case then there are less reason to have a warrant for you phone number as it is easier to access.