Getting started with Alphanumeric Sender ID

Alphanumeric Sender ID allows you to set your own business brand as the Sender ID when sending one-way messages. This feature is only available when sending messages to supported countries. Some countries require pre-registered alpha sender IDs and they can only be used to send transactional messages.

To get started, upgrade your Twilio project and start sending Messages through Twilio’s Messaging REST API. Check in your project settings to see if the Alphanumeric sender feature is enabled. If not, you will need to contact Customer Support. Once this has been completed, simply replace the ‘From’ parameter with your business name when sending messages.

What characters can I use as the sender ID?

You may use any combination of 1 to 11 letters, A-Z and numbers, 0-9. Both lowercase and uppercase characters are supported as well as spaces. 1 letter and no more than 11 alphanumeric characters may be used.

How much does alphanumeric sender ID cost?

There is no additional charge for Alphanumeric Sender ID. Pricing will be the same as is listed for sending messages via a phone number.

Can users respond to my messages that use Alphanumeric Sender ID?

No. Alphanumeric Sender ID is only used for one way communication. Recipients of messages with an Alphanumeric Sender ID will not be able to respond to you.

How do users opt out of messages sent with an Alphanumeric Sender ID

Since Alphanumeric Sender ID can only be used for one way messaging, inbound messages sent to your Alphanumeric Sender ID will not be received on your Twilio project.

Customers receiving text messages with your Alphanumeric Sender ID should have opted in to your service and been informed on how to opt out. We recommend that you provide your users with a clear description in your terms in services about how many messages they should expect to receive and how they can opt out. Spoofing of brands or companies with Alphanumeric Sender ID is not allowed.

We also highly recommend offering your users the ability to opt out of receiving SMS messages from your service by:

  • Writing to your support team
  • Calling your support phone line
  • Texting another phone number or shortcode

What happens if I use an alphanumeric sender ID when sending messages to a country that is not supported?

Your message will not be sent if you are attempting to use alphanumeric sender ID to an unsupported country. Twilio will return a 400 error response and will not accept your messages for delivery.

In this case, we recommend that you fallback to a Twilio international mobile number.

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