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The sandbox is only to prevent people from spamming phones with messages. If you get out of the sandbox and would start spamming, AWS will put your account back into the sandbox.
The documentation says:
- You can send a maximum of 20 SMS messages per second.
- You can send SMS messages to a maximum of 10 verified destination phone numbers.
https://aws.amazon.com/blogs/compute/introducing-the-sms-sandbox-for-amazon-sns/
I think these conditions are 'forever'.
You still have to pay for the SMS's sent. The free tier is only for US numbers:
From the faqs (https://aws.amazon.com/sns/faqs/)
Q: Is there an AWS Free Tier allowance for sending SMS messages?
Yes—the first 100 SMS messages you send to destinations in the United States each month are included in the AWS Free Tier. This allowance doesn't expire. Note that a "message" in this sense refers to a single transmission that contains 140 bytes of information or less, as explained in the answer to the previous question.
If you send more than 100 messages to destinations in the United States, or if you send messages to destinations outside the United States, each message you send is charged based on our current pricing rates. You can find the latest rates on the SMS Pricing page.
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Thank you for answering my question so quickly. And just to verify another thing, the first 100 SMSs per month are free right? Even in sandbox?
I guess only to US numbers:
https://aws.amazon.com/sns/faqs/
Q: Is there an AWS Free Tier allowance for sending SMS messages?
Yes—the first 100 SMS messages you send to destinations in the United States each month are included in the AWS Free Tier. This allowance doesn't expire. Note that a "message" in this sense refers to a single transmission that contains 140 bytes of information or less, as explained in the answer to the previous question.
If you send more than 100 messages to destinations in the United States, or if you send messages to destinations outside the United States, each message you send is charged based on our current pricing rates. You can find the latest rates on the SMS Pricing page.
@JaccoPK thanks. I felt like my research was incomplete or I was missing something, so it feels good to get a second verification.