Number Verification API

In the digital economy, the mobile phone number has established itself as the main identifier of a customer's identity. However, how can your company be truly sure that the number it receives belongs to the user who claims to be?

Plusmo's Number Verification API offers a cutting-edge solution that validates the authenticity and validity of a phone number in real time. This ensures that the numbers provided by your users are not only correct, but also active and operational, and, most importantly, that they match the identity of the current user. This is an essential security layer that operates silently, without generating friction.
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Frictionless Authentication: Number Verification Without User Intervention

The key to success in modern digital security is the ability to protect users without complicating their experience. Our Number Verification API achieves this balance by operating without the direct intervention of the end user.

The Problem with Traditional Verification

Traditional verification methods (such as sending one-time codes or SMS OTPs) add a step to the customer experience.

If the number provided is incorrect or inactive, the user is frustrated and the cost of verification (for each failed SMS) accumulates.

 The Plusmo Solution: Silent Verification

The Plusmo API eliminates these weaknesses. Its main objective is to verify if the phone number presented to it matches the user who is actively using your service at a given time, and all of this happens behind the scenes.

How Silent Validation Works
Our number verification process uses a secure and unique integration with mobile operators, ensuring maximum accuracy and speed

The 4-Step Verification Flow

Critical Use Cases: Where Number Verification is Essential

The versatility of the Number Verification API makes it indispensable in various sectors that prioritize security and user experience.

  •  Two-Factor Authentication (2FA) and Account Recovery: Instead of relying solely on an SMS that could be intercepted, use the API for:

    -Trust validation: Before sending an OTP, verify that the number is active and corresponds to the user. This is especially useful for countering SIM Swap attacks.

    -Password recovery: Ensure that the person attempting to reset a password is the legitimate owner of the number associated with the account.

  •  Onboarding Fraud Prevention: Prevention begins the moment a new customer registers.

    -Account registration: Prevent bots or scammers from creating accounts using false, inactive, or disposable prepaid phone numbers. Ensuring the validity of the number improves the quality of your database.

    -Churn and spam prevention: Reduce communication costs associated with inactive or invalid numbers, improving the effectiveness of your marketing and mailing campaigns.‍

  • Financial Institutions and Payments (Fintech): For any high-value transaction, certainty of identity is crucial.

    -Transaction verification: Run a silent verification before authorizing large transfers or changes to credit limits, ensuring the account is being operated by the owner of the associated number.

    -Regulatory compliance (KYC/AML): Strengthen your Know Your Customer (KYC) and Anti-Money Laundering (AML) processes by having irrefutable confirmation of the customer's digital identity.

Strategic Benefits for Your Company
Integrating Plusmo's Number Verification API provides tangible benefits that directly impact your operating costs and customer satisfaction.
Increased security: Provides a proactive defense against account takeover fraud and attacks that rely on SMS interception.
Cost optimization: Reduces expenses associated with sending failed OTP SMS to invalid or inactive numbers.
Improved user experience: Eliminate annoying extra verification steps or Captcha codes, resulting in faster and smoother onboarding and access.
High-quality data: Maintain a clean and verified customer database, improving contactability and the effectiveness of your communications.

Frequent Asked Questions

What is the difference between this API and a simple number format validator?
A format validator only confirms that the string of digits has the structure of a valid phone number. Our API goes much further: it directly queries the mobile operator to confirm if that number is authentic, active, and matches the identity of the user currently using the service or device. It is a real-time identity verification, not just format.
What happens if the phone number is inactive or invalid?
If the number is inactive, invalid, or a VoIP number not associated with a mobile operator, the API will respond negatively. In this case, your system can block registration, request a different number, or require alternative, stricter identity verification.
How is user privacy protected?
The API operates under strict security protocols. The institution only sends the phone number and the token. The mobile operator simply responds with a binary Yes/No about the match. Sensitive personal information (such as name, location, or account details) of the user is never transferred externally.
Does the user need an active mobile data connection (3G/4G/5G) for it to work?
Yes. For the verification of the match between the phone number and the active user's identity to be accurate, the user is required to be using the mobile operator's network to access the service. This ensures that the identity check is real-time and network-based.
Does the Number Verification API replace the SIM Swap API?
No, they are complementary tools. The SIM Swap API focuses on detecting if the number has been recently stolen or cloned (SIM Swap). The Number Verification API focuses on verifying that the number matches the current user. Both APIs can be integrated sequentially to offer an authentication security level of 99.9%.