To block the broadcast of authorization codes to disposable phone numbers, you can use validation services that identify and flag such numbers. APIs like NumVerify , Twilio , andPhoneValidator can help you by validating phone numbers during the registration or authentication process. These services can detect disposable or temporary numbers and prevent them from receiving sensitive information like authorization codes. By integrating one of these services into your system, you can effectively filter out disposable numbers before sending out any codes. This ensures that only legitimate phone numbers are able to receive authorization messages, improving security and preventing fraud.