Customer not receiving verification text message in the Astra SDK

Last updated: August 26, 2026

If a customer is unable to receive a verification text message when attempting to add a card or authenticate via the Astra SDK, there are a few common causes to investigate.

Things to check

  1. Mobile number, not a landline or VoIP: Confirm that the phone number on the user's profile is a US mobile number. Landline and VoIP numbers cannot receive SMS verification codes.

  2. Short code SMS reception: Verification texts are sent from short code 44398. Ask the customer to check whether they are able to receive messages from this short code, and ensure they have no SMS filtering or spam blocking enabled on their device or carrier account that might be blocking it.

  3. Location: Customers who are traveling outside the United States may not be able to receive messages sent via short code. The verification text will not be deliverable in this case.