

The phone number part significantly degrades your privacy and security
Also the signal app depends on non free software blobs, which is a huge risk to security. Claiming that Signal is open source is disingenuous. Parts of it are open source. As a whole, it is not.


It has access to your phone’s fingerprint, which is then linked to all your other activity that you do on the phone, because it has the same fingerprint.
It doesn’t need access to the phone data. All it needs is the fingerprint.