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Home » News » Telefónica Integrates Chainlink Functions on Polygon Mainnet to Safeguard Against SIM Card Tampering (crypto-news-flash)

Telefónica Integrates Chainlink Functions on Polygon Mainnet to Safeguard Against SIM Card Tampering (crypto-news-flash)

Telefónica and Chainlink fight SIM swap attacks by integrating Chainlink’s oracle network with Telefónica’s GSMA Open Gateway APIs.
Chainlink Functions connect APIs to Polygon’s blockchain network, bolstering transaction security and protecting SIM card information against fraud in Web3 applications.

Telefónica, Spain’s premier telecom giant, has announced a partnership with Chainlink, a leading Web3 oracle provider, to introduce a new defense mechanism against the prevalent threat of SIM swap attacks. 

The strategic alliance, therefore, focuses on integrating Chainlink’s oracle network with Telefónica’s GSMA Open Gateway APIs implementation. This integration facilitates secure and reliable data verification from various sources, thereby directly addressing the vulnerabilities exposed by SIM swap attacks.

Such attacks, wherein hackers gain control over a victim’s phone number to access sensitive information, have troubled individuals and organizations. Notable victims include the United States Securities and Exchange Commission.

Chainlink Functions, a prominent feature in this partnership, seamlessly connects APIs on the GSMA Open Gateway to Polygon’s Proof of Stake (PoS) blockchain network. This integration enhances the security of transactions and introduces a layer of protection for blockchain transactions, thereby ensuring the authenticity of SIM card information.

Additionally, by leveraging this technology, the alliance aims to foster a more secure digital environment, effectively mitigating risks associated with two-factor authentication (2FA) and fraud in Web3 decentralized applications (dApps) and decentralized finance (DeFi) services.


Multinational telco @Telefonica has integrated #Chainlink Functions on @0xPolygon mainnet to help smart contracts detect unauthorized SIM card changes.

Understand how Functions can provide an additional layer of security to blockchain transactions

— Chainlink (@chainlink) February 15, 2024

elefónica’s initiative to integrate the GSMA Open Gateway SIM SWAP API, initially rolled out in Brazil by Vivo (Telefónica Brazil), represents a pioneering effort to utilize telecommunications APIs within the blockchain domain.

Revolutionizing Web3 Security

The collaboration between Telefónica and Chainlink sets a new standard for security within the Web3 space, effectively addressing critical vulnerabilities such as SIM swap fraud. By enabling direct access to telecommunications data through Chainlink’s decentralized oracle network, smart contracts can verify the integrity of a user’s SIM card information in real-time. Therefore, this capability introduces an additional security layer, ensuring that blockchain transactions and digital interactions are safe and trustworthy.

Moreover, this integration extends beyond preventing SIM swap attacks, offering comprehensive security enhancements for the Web3 environment. Developers leveraging the GSMA Open Gateway API via Chainlink can now implement more effective two-factor authentication protocols and sophisticated fraud detection systems.

In addition, these improvements are crucial for building confidence in Web3 technologies, where security and privacy assurance can drive adoption and innovation.

Yaiza Rubio Viñuela, Chief Metaverse Officer at Telefónica, highlighted the significance of this integration, positioning Telefónica as a forward-thinking enabler of Web3 technologies. Additionally, she emphasized the role of such innovations in supporting developers and stakeholders as they navigate the evolving digital landscape, which she called the “web of the future.”

Expanding Presence in the Web3 Space

Telefónica’s collaboration with Chainlink represents its latest endeavor in the Web3 space, building upon previous initiatives aimed at embracing cryptocurrency and blockchain technology. In 2022, Telefónica enabled cryptocurrency payments on its online marketplace, including Bitcoin and Ether, offering users greater flexibility and convenience. 

Following the announcement of this strategic partnership,  LINK experienced a notable uptick in its market value, rising by 2% to trade at $19.96. It is worth noting that LINK remains a significant player in the digital asset space, with a market capitalization of $11.7 billion.

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