Flask-Python with SNS

Hello.

I recommend that you read the following document once to learn how to send SMS notifications with Amazon SNS.
https://docs.aws.amazon.com/sns/latest/dg/sns-mobile-phone-number-as-subscriber.html

If you are using Flask, you will be notified using something like boto3, which is an AWS SDK for Python, so I think it would be a good idea to check the following documentation as well.
https://docs.aws.amazon.com/sns/latest/dg/sms_publish-to-phone.html