TeresaGF

You can try Nexmo SMS API : http://nexmo.com (I work for them).

It gives you reach to more than 200 countries (reaching multiple operators on each country) and Long Numbers for inbound traffic in a few countries. The REST API is very simple to connect and SMPP is also supported.

Let us know if you have questions:info@nexmo.com

Thanks! We are working on US reach and we hope to have it ready at the end of June or beginning or July. We will post updates in Twitter @Nexmo and of course in our website.