Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Does kratos support phone number as login identifier?

Yes,  kratos supports that. See <https://www.ory.sh/docs/kratos/concepts/credentials/username-email-password>

Is there a way to ensure that only verified user with a phone number as login identifier can login?

I can't find a way to make sure that phone numbers are verified