A solution to not being able to enforce unique phone numbers on a field/schema level is removing verification of an entity if another entity verifies that number at a later date.
Add a setting which removes the pre-existing phone number verification if it is of the same entity type being verified. Like whack-a-mole, but with phone number verifications.
The setting would be found in phone number settings config:
Add checkbox to /admin/config/smsframework/phone_number/%
Core internals only
Adding config schema
Active
4.0
Core Framework
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