[Python] Check if WhatsApp number is registered without the API

I want to write a program that checks whether the phone number that the user enters is registered in WhatsApp. I can't use the API.

I tried to write the code and this is what I got. However, when you enter a number that is registered in WhatsApp, the console displays that the number is not registered.

import phonenumbers
from phonenumbers import carrier

def is_whatsapp_number(phone_number):
try:
phone_number = phonenumbers.parse(phone_number)
if phonenumbers.is_valid_number(phone_number):
service_provider = carrier.name_for_number(phone_number, lang="EN")
if "WhatsApp" in service_provider:
return "YES"
else:
return "NO"
else:
return "Invalid phone number"
except phonenumbers.phonenumberutil.NumberParseException:
return "Invalid phone number"

phone_number = input("Enter the phone number: ")
result = is_whatsapp_number(phone_number)
print(result)

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