Signal is working on a way to sign up without a phone number. The feature has not yet been officially confirmed, and it is not yet known whether it will be available to all users or in what form.
The opnly confirmed thing I have heard is that they can read signal messages via your notifications, if they are enabled, so always check the app manually and do not use their push service.
The opnly confirmed thing I have heard is that they can read signal messages via your notifications, if they are enabled, so always check the app manually and do not use their push service.