What Senders (Originators, Numbers) are supported in the US for A2P SMS/MMS Services?
All A2P Senders in the US are Dedicated 2-way Products. They all require some level of registration for the Brand (Sender) to the number(s). They all must support/respond accordingly to mandatory Keywords for STOP (Opt-out) and HELP (Customer Support). Supported Originators are Short Code, 10DLC (Local Numbers) and Toll Free Numbers (TFN). Alpha is not supported today.
Take a look at the Sinch SMS Product page to learn more about our SMS products, or click here to sign up to our self-service portal and get started today.
Learn how to get started with SMS by watching this step-by-step tutorial. The video explains the basics of SMS and shows you how easy it is to send your first message with Sinch:
