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AT&T In-App Messaging API

The service provides ability to incorporate SMS and MMS text and media messaging functions to handle messaging traffic to AT&T subscribers and those of other U.S. providers. It exposes subscriber mobile phone numbers and allows specification of message body and sender. Applications can dispatch messages for delivery to individuals or lists of up to 10 recipients. API methods support submission of recipient mobile number and message text up to 160 characters with ISO-8859-1 formatting. Methods also support sending MMS media messages either larger than the SMS limit or including media attachments in a variety of formats. The API can also handle replies, either to the specific sender or to all recipients.