Use phonenumbers package to validate live settings twilio number instead of regex to support EU number

engine/apps/base/utils.py

@@ -2,6 +2,7 @@ import json
 import re
 from urllib.parse import urlparse
 
+import phonenumbers
 from django.apps import apps
 from python_http_client import UnauthorizedError
 from sendgrid import SendGridAPIClient
@@ -125,7 +126,8 @@ class LiveSettingValidator:
 
     @staticmethod
     def _is_phone_number_valid(phone_number):
-        return re.match(r"^\+\d{11}$", phone_number)
+        ph_num = phonenumbers.parse(phone_number)
+        return phonenumbers.is_valid_number(ph_num)
 
     @staticmethod
     def _prettify_twilio_error(exc):