Verify phone possession without an OTP
Number Verify confirms phone possession through the carrier network. No SMS sent. No code entered.
Carrier-based Number Verification, network or SIM
No OTP required when verification succeeds
Ten countries live including the US, UK, France, Germany and Canada
What is Number Verify?
Number Verify is Authsignal's carrier-based Number Verification capability for confirming possession of a mobile number without asking the customer to enter an SMS OTP. Depending on the network and implementation, verification can use network based (Silent Network Authentication) or SIM card based methods.
Instead of relying on a code being delivered, retrieved and entered, Number Verify can confirm phone possession as part of the authentication journey. It can also be orchestrated alongside passkeys, biometrics, risk signals and other authentication methods when greater assurance is required.
Verify customers without adding another step
Strengthen phone verification
Remove the OTP interaction from eligible journeys, reducing exposure to phishing and social engineering attacks that rely on convincing customers to share a code.
Reduce authentication friction
Remove the need for customers to wait for a text message, switch context and manually enter a code.
Improve verification reliability
Reduce dependence on SMS delivery for eligible journeys, avoiding delays or failures caused by a code not arriving when the customer needs it.
Build better mobile journeys
Use Number Verify during onboarding, login or step-up without automatically introducing another visible authentication interaction.
How Number Verify works
Start the verification
A customer enters or uses their mobile number during an authentication journey.
Verify phone possession
Number Verify uses the available Number Verification method for that network and implementation, which may include Network Based (Silent Network Authentication) or SIM Card based verification.
Receive the result
If verification succeeds, the customer can continue without receiving or entering an SMS one-time passcode.
Route to another method
If Number Verification is unavailable or the journey requires greater assurance, Authsignal can introduce another authentication or verification method based on your rules.
Three ways to use Number Verify
01
Replace an OTP step
Use Number Verify instead of SMS OTP for eligible phone verification journeys.
02
Add a possession signal
Confirm that a customer has access to the mobile number associated with an account or transaction.
03
Use it as part of adaptive authentication
Combine Number Verify with risk, context and other authentication methods to determine what happens next.
Where it fits in the journey
Verify phone possession without adding another OTP step to sign-up.
Use Number Verify as a low-friction possession check during eligible mobile login journeys.
Add phone possession verification for sensitive actions without immediately introducing another visible challenge.
Use phone possession as one signal within a broader account recovery journey.
Confirm access to a mobile number without relying on an SMS code.
Introduce Number Verify into existing authentication journeys as part of a broader move away from SMS OTP over time.
One more method in the rules engine you already use
Number Verify is not a standalone product. It is another verification method inside Authsignal's authentication and orchestration platform, governed by the same rules engine, the same flow builder, and the same adaptive policies that already control your passkeys, biometrics, OTP, and push verification.
Add carrier-based Number Verification to existing journeys without replacing your identity stack. No migration needed.
Apply logic based on risk, device, geography and carrier eligibility to decide when a journey uses Number Verify.
Passkeys, push, biometrics and SMS OTP are alternatives when Number Verification is unavailable or another method is more appropriate.
Number Verify events sit alongside your other authentication events, so you can see what happened and why.
Powered by global network connectivity
Authsignal delivers Number Verify in partnership with Aduna, bringing carrier-based Number Verification into the Authsignal platform. By aggregating standardized carrier APIs through a common CAMARA-based layer, Aduna reduces the need for businesses to build and manage separate integrations with individual mobile networks.
Number Verify is available across 10 countries globally, including the United States, United Kingdom, Canada, Australia, France, Germany, Brazil, Netherlands, Spain and India. More countries will be supported as carriers are added.
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Verify the phone without sending a code
Add Number Verify to your existing authentication journeys and give eligible customers a more secure, reliable and lower-friction path through phone verification.