Need to Send SMS in US

To send SMS messages in the USA using Amazon SNS, you've already taken some important steps by enabling Production mode and completing 10DLC (10-Digit Long Code) registration. However, there are a few more things you should check and potentially do to ensure your SMS sending is working properly:

1. Verify your 10DLC brand and campaign registration: Make sure your brand and campaign have been fully approved in the AWS console. This process can take a few days to complete.

2. Check your origination identity: Ensure you have a valid origination identity for sending SMS to US numbers. This could be your 10DLC number, a toll-free number, or a short code.

3. Review message content: Make sure your message content complies with carrier guidelines and doesn't contain anything that might trigger spam filters.

4. Check sending limits: Verify that you haven't reached any sending limits or quotas for your AWS account.

5. Monitor CloudWatch logs: Look for detailed error messages or delivery statuses that might provide more insight into why messages aren't being sent.

6. Test with different recipient numbers: Try sending to various phone numbers to determine if the issue is specific to certain carriers or numbers.

7. Verify number format: Ensure the destination phone numbers are correctly formatted with the appropriate country code (+1 for the US).

8. Check for opt-outs: Make sure the recipients haven't previously opted out of receiving messages from your number.

If you've verified all these points and are still experiencing issues, it may be worth contacting AWS Support for a more in-depth investigation of your specific account and campaign settings. They can provide tailored assistance based on your configuration and use case.

Remember that even with proper registration and setup, carrier policies and recipient preferences can still impact message delivery, so 100% delivery rates are not guaranteed.
Sources
SNS SMS Deliverability Issue (TEXT_BLOCKED) Despite 10DLC Registration | AWS re:Post
What is the proper way to send an SMS to US users? | AWS re:Post