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I never trusted the Twitter backend, so have always used an anonymized phone number, birthday and email

I'm glad I did

Just need to change my phone number and I'm set.

Same I just checked and I have completely fake details and a throw away email. I love it when my past self does cool stuff !

What services do you use for anonymized phone number?

I used Google Voice with a couple layers of indirection. Some day I may get a burner prepaid phone if I'm even more concerned about my identity.