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Twilio error 30034? Why your app's texts to US numbers are blocked

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Source checked 8 Oct 2026 · Published 23 Oct 2026 · Last reviewed 23 Oct 2026 · By Ctrl+Z Therapy (how we test)

The short answer

Twilio error 30034 means a message from an unregistered number. Twilio blocks messages to U.S. numbers when you send from a +1 10DLC number that is not associated with an approved A2P 10DLC Campaign. Usually your Brand or Campaign registration isn't complete yet, or the number isn't in the Messaging Service linked to your approved Campaign.

What to do

  1. Complete A2P 10DLC registration for your Brand and Campaign.
  2. Add the phone number to the Sender Pool of the Messaging Service linked to your approved Campaign.
  3. Need to send before registration is done? Twilio suggests a sender type outside A2P 10DLC: a toll-free number, a short code, or Twilio Verify for verification codes.

Good to know

  • This is about US recipients texted from a +1 10DLC number. Other countries have their own rules.

Source

Checked on 8 Oct 2026. Prices, limits and settings change, so check the source before you rely on them.