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Signal and Threema want nothing to do with WhatsApp
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Doesn't signal now have username support? I thought i saw it released a week or so ago.
It still needs a phone number for registration. You just don't need to share it with people you want to talk with.
You can use Session (getsession.org) without any phone number. It is based somewhat on the Signal code base, and it's a decent alternative for some.
That doesn't solve the issue that you have to give them a phone number to start an acc.