send_sms.py

import boto3
client = boto3.client('sns',
                      aws_access_key_id=settings.AWS_ACCESS_KEY_ID,
                      aws_secret_access_key=settings.AWS_SECRET_ACCESS_KEY,
                      region_name='ap-northeast-1')
for phone in recipient_list:
  client.publish(
    PhoneNumber=phonenumbers.format_number(phone, phonenumbers.PhoneNumberFormat.E164),
    Message=message,
  )