How do I add a Polish phone number for 2-step verification on Apple Account?

Re: "2-steps verification problem

I can't add my Polish phone number to my apple account.

Without this I can't delete this bad apple account. Any solution?"

Wondering whether Apple support's linked articles below can help:

About trusted phone numbers and trusted devices for Apple Account

and

See how to: Get a verification code and sign in with two-factor authentication - Apple Support

Support if needed:

Polish - Oficjalne Wsparcie Apple

or

See a list of Apple phone numbers around the world

Scroll to "Connect with Live Support"

and choose your country for the phone number to ring

Contact Apple Support - Apple Support