How to send SMS through AWS?
I believe you will need to do this programmatically using the AWS SDK as described in Sending a Message (AWS SDKs). Here is a quote a from it:


  To send an SMS message by using one of AWS SDKs, use the action in
  that SDK that corresponds to the Publish request in the Amazon SNS
  API. With this request, you can send an SMS message directly to a
  phone number
  
  ...
  
  Sending a Message (AWS SDK for Java)
  
  The following example uses the publish method of the AmazonSNSClient
  class to send a message directly to a phone number:

public static void main(String[] args) {
        AmazonSNSClient snsClient = new AmazonSNSClient();
        String message = "My SMS message";
        String phoneNumber = "+1XXX5550100";
        Map&lt;String, MessageAttributeValue&gt; smsAttributes = 
                new HashMap&lt;String, MessageAttributeValue&gt;();
        //&lt;set SMS attributes&gt;
        sendSMSMessage(snsClient, message, phoneNumber, smsAttributes);
}

public static void sendSMSMessage(AmazonSNSClient snsClient, String message, 
      String phoneNumber, Map&lt;String, MessageAttributeValue&gt; smsAttributes) {
        PublishResult result = snsClient.publish(new PublishRequest()
                        .withMessage(message)
                        .withPhoneNumber(phoneNumber)
                        .withMessageAttributes(smsAttributes));
        System.out.println(result); // Prints the message ID.