Amazon SNS now supports SMS in the USA. But what about the rest of the world? USA is around 5% of the world mobile market. We are happy to (re) announce that with Amazon SNS and Nexmo you can reach the remaining 95% without much change of your existing code! Using the Nexmo Amazon SDK, you can easily subscribe your mobile users to a given topic and they will be automatically notified via SMS when you will be publishing messages. Here is a detailed how-to: http://www.nexmo.com/documentation/libs/index.html#sns

What is also very cool is that you would benefit from Nexmo wholesale pricing and 1-hop model that cuts out the middle man, improves SMS deliverability and reduce latency.