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SMS sender numbers

When you enable SMS in Customer.io, we’ll sync your phone numbers and short codes. This page explains a bit more about how to add new phone numbers so you can select different senders for different messages.

Syncing Phone Numbers (Senders) to Customer.io

If you add or change any of your sender identities in your Twilio account, you’ll need to re-sync them in Customer.io before you’ll see your changes in Customer.io.

Go to > Workspace Settings > SMS and click Sync from Twilio.

Using a Manual Sender ID

You’ll see Manual Sender IDs in your Twilio Settings. You can add an Alphanumeric Sender ID, a Message Service ID, or provide some Liquid that dynamically determines the Sender ID for each message here.

Alphanumeric ID

Alphanumeric IDs can help your messages stand out, but they have a few quirks:

• They’re one-way: Your customers cannot reply to them.
• Opt-in/opt-out: Customers must opt into messages from your ID, and be informed on how to opt out.
• Alphanumeric IDs aren’t supported in all countries, including the USA: If you try to send to an unsupported country from an Alphanumeric Sender ID, your message will fail to send.

Set up an alphanumeric ID

1. Enable alphanumeric IDs in Twilio first! You can add alphanumeric senders in Customer.io, but if you haven’t enabled the feature in Twilio, messages using your alphanumeric sender will fail.

2. Go to > Workspace Settings > SMS and click Add Sender ID.

3. Enter your Sender ID and the Name you’ll use to refer to your sender.

   • Name: this is how you’ll refer to the ID internally; your customers won’t see this.
   • Sender ID: You can use both upper- and lower-case ASCII letters, digits 0 through 9, and spaces in your ID. Your ID must contain at least one character that isn’t a number.