In-House vs. API-First for Phone Number Portability Checks

Cost-EffectivenessBuilding in-house phone number portability checks incurs significant upfront and ongoing costs for infrastructure, data licensing, and maintenance, while API-first solutions offer a pay-as-you-go model, often reducing total cost of ownership.

Accuracy & CoverageAPI-first providers specialize in maintaining extensive and up-to-date databases for global portability, offering higher accuracy and broader coverage than most in-house systems can achieve.

Time-to-MarketIntegrating a pre-built API for portability checks is significantly faster than developing and deploying an in-house solution, accelerating fraud prevention and compliance efforts.

Maintenance & ScalabilityAPI-first solutions offload maintenance, updates, and scaling to the vendor, freeing internal teams to focus on core business logic and ensuring reliable performance as demand grows.

The Critical Role of Phone Number Portability Checks

In today's digital landscape, phone numbers have become a cornerstone of identity, authentication, and communication. From multi-factor authentication (MFA) to KYC (Know Your Customer) processes, customer communication, and fraud prevention, the integrity of a phone number is paramount. However, a significant challenge arises with phone number portability – the ability for users to switch carriers while retaining their existing number. While convenient for consumers, this feature introduces complexities for businesses trying to verify identity and prevent fraud.

A phone number portability check determines if a number has recently been ported from one carrier to another. This information is crucial because recent porting can be a strong indicator of fraudulent activity, particularly SIM swap fraud. In a SIM swap attack, fraudsters trick carriers into transferring a victim's phone number to a SIM card they control, allowing them to intercept OTPs, reset passwords, and gain access to sensitive accounts.

For businesses, understanding a number's portability status is not just about fraud prevention; it's also about optimizing communication strategies. Sending SMS messages to a recently ported number might incur unexpected costs or delays if the carrier information is outdated. Therefore, integrating robust phone number portability checks is no longer a luxury but a necessity for any organization operating online.

The In-House Development Approach: Control vs. Complexity

Some organizations, particularly larger enterprises with extensive engineering resources, might consider building their own in-house system for phone number portability checks. The allure of an in-house solution often stems from the desire for complete control over data, customization, and integration with existing infrastructure. However, this path is fraught with significant technical and operational hurdles.

Technical Challenges:

• Data Acquisition & Maintenance: To perform portability checks, you need access to vast, constantly updated databases of carrier information, Mobile Network Codes (MNCs), and Mobile Country Codes (MCCs). Acquiring licenses for this data is expensive and establishing reliable data feeds from multiple global carriers is a monumental task.
• Real-time Updates: Phone number portability data changes constantly. Maintaining a system that can ingest, process, and update this information in real-time requires sophisticated data engineering and significant infrastructure.
• Global Coverage: Achieving comprehensive global coverage is incredibly complex. Different countries have varying regulations and data access mechanisms, requiring tailored solutions for each region.
• Accuracy & Latency: Ensuring high accuracy and low latency for checks across millions, if not billions, of numbers demands robust, optimized algorithms and high-performance computing.

Operational & Cost Implications:

• High Upfront Investment: Significant capital expenditure is required for infrastructure, data licenses, and initial development efforts.
• Ongoing Maintenance: A dedicated team of engineers, data scientists, and operations personnel will be needed for continuous maintenance, bug fixes, data updates, and system scaling.
• Opportunity Cost: Diverting valuable engineering resources to build and maintain a non-core function like portability checks means those resources aren't focused on innovating your primary product or service.
• Scalability Concerns: Scaling an in-house solution to handle increasing volumes of checks can be challenging and costly, requiring further infrastructure investments and engineering effort.

Practical Example: A large e-commerce company decides to build an in-house portability check. After six months of development, they realize they only cover their primary market, and the data is already slightly outdated. The cost of data licenses for broader coverage alone exceeds their initial budget, and their security team is stretched thin trying to maintain the system while also addressing core application vulnerabilities.

The API-First Approach: Efficiency, Accuracy, and Scalability

In contrast to the in-house model, an API-first approach leverages specialized third-party providers who offer phone number portability checks as a service. This model has gained significant traction due to its numerous advantages, particularly for businesses seeking efficiency, accuracy, and scalability without the overhead of internal development.

Key Benefits:

• Rapid Integration: API-first solutions are designed for quick and easy integration. A few lines of code can connect your system to a powerful portability checking service, significantly reducing time-to-market.
• High Accuracy & Global Coverage: Dedicated providers specialize in maintaining comprehensive, up-to-date databases from various global sources. They invest heavily in data acquisition, cleansing, and real-time updates, offering superior accuracy and broader geographic coverage than most individual businesses can achieve.
• Cost-Effectiveness: Most API services operate on a pay-as-you-go model, meaning you only pay for the checks you perform. This eliminates large upfront investments and converts a variable cost into a predictable operational expense, often resulting in a lower total cost of ownership.
• Reduced Maintenance Burden: The API provider is responsible for all infrastructure, data updates, and maintenance. This frees your internal engineering teams to focus on core business logic and innovation, rather than maintaining a non-differentiating utility.
• Scalability: API services are built to handle massive volumes of requests. As your business grows, the API scales seamlessly with your needs, without requiring any additional effort or investment from your side.
• Enhanced Fraud Prevention: Many API providers integrate portability checks as part of a broader fraud prevention suite, offering additional signals like SIM swap detection, phone number type, and carrier information to provide a more holistic risk assessment.

Practical Example: A rapidly growing fintech startup needs to implement robust fraud prevention for new user onboarding. Instead of building from scratch, they integrate a phone number verification API. Within days, they can perform real-time portability checks alongside other phone number intelligence (e.g., line type, carrier, risk score). This allows them to quickly identify and flag potential SIM swap attempts, drastically reducing their fraud exposure without diverting critical engineering resources from developing their core financial products.

How Didit Helps

Didit provides a comprehensive, API-first identity platform that includes advanced phone number verification capabilities, including portability checks. Our solution is designed to be highly accurate, scalable, and easy to integrate, allowing businesses to enhance their fraud detection and compliance efforts without the complexities of in-house development.

• Real-time Portability Checks: Integrate our API to instantly determine if a phone number has been recently ported, a key indicator for SIM swap fraud.
• Comprehensive Phone Verification: Beyond portability, Didit offers OTP delivery via SMS, WhatsApp, Telegram, RCS, or voice call, coupled with crucial intelligence like SIM swap detection, carrier lookup, and blocking of VoIP/disposable numbers.
• Unified Identity Platform: Our phone verification module is part of a broader suite of identity primitives, including ID verification, biometrics, and AML screening, all accessible through a single API or visual workflow builder. This provides a holistic view of user identity and risk.
• Global Coverage & Accuracy: Didit maintains extensive, up-to-date global databases, ensuring high accuracy and broad coverage for all your phone verification needs.
• Pay-as-You-Go Pricing: With Didit, you only pay for successfully completed verification steps, eliminating upfront costs and providing a transparent, cost-effective solution.

By leveraging Didit's API-first approach, businesses can quickly deploy sophisticated phone number portability checks, significantly bolstering their fraud prevention strategies while optimizing operational costs and freeing up valuable engineering resources.

Ready to Get Started?

Don't let the complexities of phone number portability expose your business to fraud or hinder your user experience. Explore how Didit's API-first solution can provide accurate, scalable, and cost-effective phone number portability checks, integrating seamlessly into your existing systems. Enhance your security, streamline your onboarding, and protect your users today.

Visit our pricing page to see how affordable advanced identity verification can be, or check out our technical documentation to begin your integration. You can also contact us at hello@didit.me for a personalized consultation.