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The blacklist is applied by HUB2, not by the providers, although providers may have similar mechanisms of their own.
HUB2 can restrict an MSISDN (phone number) for transfers. A transfer to a restricted MSISDN fails with the failure cause recipient_unavailable, before it is sent to the provider. HUB2 keeps a separate list for payments: a payment from a number restricted for payments fails with the same cause. The check runs after the balance check, so a transfer from an unfunded account fails with insufficient_funds first. It does not apply in sandbox. A delegated transfer to a restricted MSISDN returns 201 with a transfer in the failed status, whose failure cause is recipient_unavailable.

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Restricted numbers are managed by HUB2 support. If you think a number is restricted by mistake, contact HUB2 support.