# Silent Network Auth — verify a phone number without OTP

> SNA verifies a user's mobile number directly with their telecom operator — no OTP, no tap, no app switch. Authentication completes in under a few seconds, at the network layer.

## How it works
The OTPless SDK opens a one-time SNA URL on the cellular data interface (Wi-Fi is bypassed). The operator confirms the SIM is active and the network identity matches, and OTPless issues a signed auth token. The user does nothing and never sees an OTP screen.

## Why it matters
- ~2–4 seconds, zero user taps.
- Immune to SIM-swap, OTP phishing, OTP forwarding, and credential stuffing because the handshake is at the network layer.
- No permission prompts required.

## Coverage
Telco-dependent. Live across India (Airtel, Vi, Jio) and 38+ countries including the US, UK, EU, SEA, and parts of LATAM, MENA, and Africa. SNA coverage is shown as % of country subscribers reachable.

## FAQ
**What is Silent Network Authentication?** SNA verifies that a user holds a specific SIM by talking directly to the mobile carrier over the cellular data channel — no OTP code, no tap, no app switch.
**How fast is it?** Under four seconds at P90 with zero user taps.
**Is it secure against SIM swap and phishing?** Yes — network-layer verification is immune to SIM-swap, OTP phishing, OTP forwarding, and credential stuffing.
**Where is SNA available?** India (Airtel, Vi, Jio) and 38+ countries.

Talk to our team: https://otpless.com/talk-to-sales.html