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SIM Swap API (Beta)

Frictionless authentication for your mobile apps

Vonage SIM Swap API determines when a SIM swap was performed on a mobile number. It can even confirm if a SIM swap occurred within a specific date range. This stronger authentication process makes your apps safer from fraud and malicious attacks. And the frictionless experience is a big plus for your customers. That’s a win-win.

See developer documentation
Image illustrating Sim Swap



Enhanced security

Vonage SIM Swap API adds robust security measures that don’t rely solely on other channels — SMS, email, or voice — or traditional 2FA. This dedicated focus brings enhanced security to your assets, sensitive information, and mobile apps.

Customer trust

Differentiated fraud prevention helps build loyalty among your customers, lowers the risk of reputational damage from data breaches and attacks, and offers a better customer experience.

Financial stability

Financial losses due to fraud and unauthorized transactions can add up fast. Our API helps you avoid legal fees and fraud mitigation and recovery effort costs.
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Regulatory compliance

Vonage SIM Swap API complies with consumer data and privacy regulations like GDPR and HIPAA. It also complies with security regulations like CI DSS, and CAMARA/GSMA standards.



image of hand holding mobile phone and iconography of a sim card being swapped out

How Vonage SIM Swap API works in the real world

From amplifying traditional 2FA, adding a risk factor or fraud score to customer accounts, or managing employee identity theft — the Vonage SIM Swap API can create safer, better experiences. Here are just a few ways to use the API with your business:

  • Banking, finTech, and insurance: Add an extra verification layer to monitor SIM activity when a transaction is flagged as suspicious. Even receive notifications of unusual or frequent SIM behaviors to detect and prevent fraud before it happens. Also ensure that Transaction Authentication Number (TAN)-based transactions are authorized by the user — which decreases the risk of unauthorized access and fraud attempts.

  • Social networks: Safeguard against account hijacking, data breaches, and identity theft by using the API to continuously monitor and identify suspicious SIM swapping activities linked to user accounts.

  • Corporate protection: Protect against hijacking of company personnel phone numbers or other sensitive information, like internal corporate communications and documents — preventing potential business losses.

  • Ecommerce and retail: Enhance the security of online payment transactions to prevent fraud and confirm the legitimacy of payments, ensuring a safe shopping space for customers.

Screenshot showing the Network Registry interface

Get access to SIM Swap API through the Vonage Network Registry.

The Vonage Network Registry reduces network complexities for developers, businesses, and communication service providers (CSPs) and:

  • Offers a single process and centralized location for developers to register for access to Network APIs (like SIM Swap) and CSP networks.

  • Makes it easy for CSPs to securely scale and standardize network access for developers and customers.

  • Provides enterprises and developers with convenient access to network capabilities, using Vonage Network APIs, to build better and more secure apps.

Vonage APIs for security

SIM Swap, Number Verification: Which API is right for you? Vonage solutions help make your mobile apps more secure, with less disruption to your customers.

Type of API

Best for…

Avoid if…


Combining with a 2FA workflow to ensure that a phone number has not recently changed SIM cards.

Your business does not require an extra layer of security checks.

Developers who have their own failover methods and want a stand-alone API to customize the user journey.

You need failover methods, like SMS or email, in the event of no coverage.



Illustration of Number Verification

What goes well with SIM Swap? Our Number Verification API.

Vonage Number Verification API uses the mobile device’s number itself as an identity credential — and confirms that the number matches the SIM data for validation — through a direct carrier connection.

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For Communications Service Providers

Monetize your network investment - partner with us today

If you’re a CSP, you’ve already invested billions in 5G network upgrades. Our Network APIs can help you take that investment to the next level — and transform your network into a programmable service platform.

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