Red Oxygen combines the functions and capabilities of email with text messaging to let its users do things like deliver emails as SMS and receive SMS replies in their email inbox. Red Oxygen can deliver SMS to more than 590 cellular networks worldwide, including all U.S. carriers. They deliver messages of up to 765 characters in length and support characters from all languages. Messages are automatically encrypted to protect users' privacy.
The Red Oxygen API allows users to access the SMS gateway directly to send automated text message alerts, intelligently respond to text message replies, and more. The API uses REST calls issued in XML format.