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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.

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Last update:
‎07-25-2025 04:03 AM
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