NumberVerify2.

Q: What is Silent Authentication?

Silent Authentication verifies mobile users without sending an OTP or requiring user interaction by using network-based identity verification.

Q: How does Silent Authentication work?

Silent Authentication verifies a user's phone number through mobile network credentials instead of using one-time passwords.

Q: What is TS.43 Authentication?

TS.43 is a GSMA standard that enables silent authentication using EAP-AKA cryptographic verification through mobile network infrastructure.

Q: Is Silent Authentication more secure than SMS OTP?

Yes. Silent Authentication eliminates OTP interception, phishing attacks, and code-sharing risks because no verification code is generated.

Q: What is the difference between Silent Authentication and OTP?

OTP authentication requires users to enter a code, while Silent Authentication verifies identity directly through the mobile network.

Q: What is USSD fallback in Silent Authentication?

USSD fallback enables authentication on devices and networks where standard TS.43 authentication cannot complete.

Q: Which businesses use Silent Authentication?

Banks, fintechs, telecom operators, digital wallets, eCommerce companies, and enterprise applications use Silent Authentication.

NumberVerify2. Your network already knows.

NV2 is the CAMARA v2.0 standard that lets operators monetise phone number verification — no OTP, no user step. Its CIBA+TS.43 token extends verification to Wi-Fi, closing NV1's biggest gap.

Get NV2 API Access MNO Partnership Enquiry

104+

MNOs in U2opia's network

2G to 5G

Full coverage via TS.43 + USSD

<300ms

Silent auth latency — no OTP wait

User steps — fully passive authentication

WHAT IS NUMBERVERIFY2 (NV2)

Your network verifies every subscriber silently. NV2 makes that sellable.

NumberVerify2 is the CAMARA Number Verification API v2.0 — a GSMA Open Gateway standard that exposes the MNO's subscriber verification capability as a REST API.

Enterprises ask one question: "does this phone number match the SIM in this device?" The operator's network answers in under 500ms — no OTP sent, no code typed.

STEP 01

Enterprise calls API

App sends the phone number to verify via the U2opia NV2 endpoint.

STEP 02

Operator routing

U2opia routes to the correct MNO across 104+ operators.

STEP 03

Network-side lookup

The MNO checks the number against the SIM in the requesting device.

STEP 04

Match returned

Verified match or mismatch — sub-500ms, zero user action.

WHAT CHANGED

The Wi-Fi gap was NV1's biggest limitation. NV2 closes it.

NV1 only works when the device is on mobile data — on Wi-Fi, verification fails and falls back to OTP. NV2 pre-fetches a CIBA+TS.43 token tied to the SIM while mobile data is available, then completes verification over any connection. The result: the largest source of false negatives in number verification is eliminated.

	NV2 (v2.0)	NV1 (v1.0)
Wi-Fi verification	Yes — CIBA+TS.43 token ✓	No — mobile data only
Token pre-fetch	Yes — CIBA flow ✓	Not supported
CAMARA maturity	Stable (Fall25) ✓	Stable (Spring24)
OTP required	No — SIM match is proof ✓	No — SIM match is proof
SIM swap detection	Integrated signal ✓	Separate API call
False negative rate	Significantly lower ✓	High on Wi-Fi sessions
Recommended for	All new integrations ✓	Legacy / migration

Wi-Fi verification

✓
Yes — CIBA+TS.43 token

No — mobile data only

Token pre-fetch

✓
Yes — CIBA flow

Not supported

CAMARA maturity

✓
Stable (Fall25)

Stable (Spring24)

OTP required

✓
No — SIM match is proof

No — SIM match is proof

SIM swap detection

✓
Integrated signal

Separate API call

False negative rate

✓
Significantly lower

High on Wi-Fi sessions

Recommended for

✓
All new integrations

Legacy / migration

FOR MOBILE NETWORK OPERATORS

You already verify every number.
NV2 turns it into API revenue.

Through GSMA Open Gateway, enterprises pay per verification call against your subscriber database — a capability your network already runs at near-zero incremental cost. U2opia handles the CAMARA implementation, enterprise billing, and settlement; you receive a per-verification revenue share.

TECHNICAL SPECIFICATION

A production-grade CAMARA API, operator-native by design.

NV2 follows the CAMARA OpenAPI specification within the GSMA Open Gateway framework — interoperable with any compliant operator or aggregator. Everything below ships in U2opia's standard implementation.

Capability	What it means	Spec
Sub-500ms latency	The subscriber lookup is a native network operation, not a user-facing round trip.	avg ~280ms · p99 <500ms
CAMARA OpenAPI	Standard REST specification, interoperable across operators and aggregators.	CAMARA Fall25 · stable
GSMA Open Gateway	Common commercial and technical framework across the operator ecosystem.	73+ groups · 285 networks
CIBA+TS.43 Wi-Fi extension	Token pre-fetched on mobile data completes verification over Wi-Fi.	TS.43 R11 · EAP-AKA
SIM swap signal	Responses carry a risk flag if a SIM swap occurred in the last 72 hours.	CAMARA Device Status
No OTP, no user step	Entirely server-side — the user never sees a code, prompt, or wait state.	Zero user friction

Sub-500ms latency

The subscriber lookup is a native network operation, not a user-facing round trip.

avg ~280ms · p99 <500ms

CAMARA OpenAPI

Standard REST specification, interoperable across operators and aggregators.

CAMARA Fall25 · stable

GSMA Open Gateway

Common commercial and technical framework across the operator ecosystem.

73+ groups · 285 networks

CIBA+TS.43 Wi-Fi extension

Token pre-fetched on mobile data completes verification over Wi-Fi.

TS.43 R11 · EAP-AKA

SIM swap signal

Responses carry a risk flag if a SIM swap occurred in the last 72 hours.

CAMARA Device Status

No OTP, no user step

Entirely server-side — the user never sees a code, prompt, or wait state.

Zero user friction

ENTERPRISE USE CASES

Who purchases NV2 — and why OTP no longer works for them.

Each enterprise segment driving NV2 adoption has a specific way OTP fails — by regulation, by friction, or by delivery. NV2 replaces the entire OTP chain with one silent network-side check.

Banking & BFSI

Network-based verification that satisfies the mandates.

E-Commerce & Fintech

Same fraud signal, zero friction, nothing to phish.

Gaming & OTT

Verification inside the API call; no SMS cost or wait.

Hyperscalers & Cloud

Confirms account number matches the SIM in the device.

Enterprise SaaS

Silent SIM-to-number check before privileged access.

Emerging Markets

No delivery dependency — verification is network-layer.

OPERATOR NETWORK REACH

104+ operators. 60+ countries. One NV2 API contract.

Enterprises integrate once against U2opia's NV2 endpoint and get global coverage — routing, Open Gateway commercials, and per-operator compliance handled. Operators joining the network gain immediate access to the full enterprise customer base.

South Asia (India+)

22+ MNOs

NV2 Ready ✓

Southeast Asia

18+ MNOs

NV2 Ready ✓

Middle East & Africa

24+ MNOs

Expanding

Europe

21+ MNOs

NV2 Ready ✓

Americas

12+ MNOs

NV2 Ready ✓

APAC (excl. SEA)

7+ MNOs

Expanding

FREQUENTLY ASKED QUESTIONS

NumberVerify2 (NV2) — questions answered

Expand All Collapse All

What is Silent Authentication?

Silent Authentication verifies mobile users without sending an OTP or requiring any user action. Authentication happens at the mobile network level using SIM credentials.

How does Silent Authentication work?

Silent Authentication uses network-based identity verification, allowing applications to confirm a user's phone number through the mobile operator without displaying an OTP screen.

What is TS.43 Authentication?

TS.43 is a GSMA standard that enables silent authentication using EAP-AKA cryptographic verification through mobile network infrastructure.

Is Silent Authentication more secure than SMS OTP?

Yes. Silent Authentication eliminates OTP interception, phishing attacks, and code-sharing risks because no verification code is generated or entered.

What is the difference between Silent Authentication and OTP?

OTP authentication relies on a code sent to the user. Silent Authentication verifies the user directly through the mobile network without requiring any code entry.

What is USSD Fallback in Silent Authentication?

USSD fallback allows authentication to continue on devices or networks where TS.43 authentication cannot complete, extending coverage to older mobile devices.

Which businesses use Silent Authentication?

Banks, fintech companies, telecom operators, digital wallets, super apps, eCommerce platforms, and enterprise applications use Silent Authentication to improve security and user experience.

GET STARTED

Ready To Reach Every Mobile User?

Start with SilentAuth+ and add customer experience and payments as you grow. One platform, carrier-grade, global.

Explore Authentication Explore Payments