Amazon SNS allows developers to send messages from applications and systems on a pay-what-you-use basis. As for pricing, sending via SMS is the most expensive option within Amazon SNS: although the first 100 SMS messages are free any subsequent messages are charged at a rate of $0.75 per 100, and data transfer charges also apply.
The addition of SMS to SNS brings the total numer of supported protocols to six:
- Email in JSON format
- Amazon SQS
Amazon SNS is still in beta so some restrictions apply.