Are you interested in passing additional information about your subscribers, like what mobile phone carrier they're using, in something like a query string within your SMS message? If so, you're in luck as that's what our carrier ID merge tag does.


  1. When creating a message, use the merge tag {i} in your message.
  2. That's it, finish your message as you normally would, then send/schedule/save. When someone receives a message with the merge tag {i}, it will be replaced with their carrier ID, so for example, 79 (T-Mobile) or 383 (AT&T).

Additional Notes

  • To view a list of carrier ID's, click here.
  • If for some reason a phone number is missing a carrier ID, it will be sent as a blank carrier ID.

Search Tags

  • merge tag, merge-tag, subscriber phone number, customize, personalize, MDN, obfuscation scheme, obfuscation schemes, query string, carrier id, wireless carrier id.
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