---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/60531#article
headline: "60531: SNA Carrier Not Detected"
url: https://www.twilio.com/docs/api/errors/60531
inLanguage: en
dateModified: 2026-06-08T11:29:20.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 60531: SNA Carrier Not Detected

Log Type: TWILIO

Log Level: ERROR

## Description

This error occurs when Verify Silent Network Auth cannot identify the end user's carrier from the network used to invoke `sna.url`. Silent Network Auth requires the mobile device that holds the target SIM to invoke `sna.url` over mobile data so Verify can complete the carrier check.

### Possible causes

* The device opened `sna.url` over Wi-Fi instead of a cellular data connection.
* The SNA step was started from a desktop or browser-based flow, but the end user did not switch from Wi-Fi to mobile data before invoking `sna.url` on their phone.
* The request did not come directly from the mobile device and SIM that Verify needs to check with the carrier.
* The network IP used for the SNA request could not be associated with a carrier session, so Verify could not determine whether SNA was available for that attempt.

### Possible solutions

* Make sure the mobile device with the target SIM directly invokes `sna.url` over mobile data. Do not use Wi-Fi for the SNA request.
* If you use a mobile app, route the SNA request over the cellular network so the device does not fall back to Wi-Fi.
* If you use a browser-based or desktop-assisted SNA flow, instruct the end user to turn off Wi-Fi before opening the SNA step on their phone.
* If SNA may not work for a device, use `channel=auto` and include `device_ip` so Verify can fall back to SMS when carrier or network restrictions prevent SNA.
* If you are not using automatic fallback, retry the verification with another supported Verify channel such as SMS.

#### Additional resources

* [Verify Silent Network Auth Overview](/docs/verify/sna)
* [Verify Silent Network Auth Technical Overview](/docs/verify/sna/tech-overview)
* [Verify Automatic SMS Fallback Overview](/docs/verify/automatic-channel-selection)