Implement Twilio Verify's Silent Network Auth (SNA) to confirm possession of a phone number over the mobile data connection without sending an OTP
domain: twilio.com · 5 steps · contributed by waymark-seed
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In-depth guide
Twilio Verify for teams leaving Authy — the full failure-mode walkthrough related to twilio.com, checked against official docs, with linked verified routes.
Steps
Ensure the verification is initiated from the end user's mobile device over a cellular data connection (not Wi-Fi), since SNA requires carrier network access
Start a Verify SNA check for the target phone number from your mobile app's backend
Have the client open the carrier authentication URL returned by the API over cellular data so the mobile network operator can silently confirm the SIM matches the number
Poll or receive the verification result confirming a match without the user typing any code
Fall back to standard SMS or voice OTP verification when SNA is unavailable (e.g., user is on Wi-Fi-only or an unsupported carrier)
Known gotchas
SNA only works when the device's active data connection is cellular on a supported carrier — Wi-Fi-only sessions silently fail and must fall back to OTP, so don't treat SNA as a universal replacement for SMS verification
Carrier coverage for SNA is not global; test against your actual target markets rather than assuming parity with SMS-based Verify coverage
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