### Answer
Retell AI doesn't currently have a built-in feature to block specific incoming phone numbers.
If you're using
custom Twilio integration, you can block numbers through Twilio's blocking functionality:
[(1) ](
)
This has been noted as a potential feature request for Retell AI.
If you need to delete a phone number you own from your Retell account (rather than block incoming callers) , you can use the Delete Phone Number API endpoint. [(1) ](
)