Global communications businesses proliferated during the pandemic years with the rise of working from home (WFH). At the same time, businesses suffered from rising cases of fraud as newer and more complex fraudulent activities robbed telecom corporations of billions of dollars. Such frauds have not only dented businesses financially but have also caused a loss of reputation and trust, triggering customer churn. In its latest Fraud Loss Survey report, the Communications Fraud Control Association estimates global fraud losses in the telecom industry at $39.89 billion - about 2.22% of the industry's total global revenue. To understand what SIM box fraud is and why it has featured among the top telecom scams in the past few years, read on.
What is a SIM box fraud?
SIM box fraud is among the most demanding challenges telecom operations face globally. The Fraud Loss Survey Report 2021 has pegged losses from SIM box fraud and the broader interconnect bypass fraud at $3.11 billion, or 7.8% of global telecom fraud losses. Interconnect bypass fraud is the umbrella category for any technique that illegally routes international traffic around a carrier's official gateways to avoid termination fees, and SIM box fraud is by far its most common method. SIM box fraud diverts international calls to a cellular device through the internet. This device, called a SIM box, routes international calls back into the network as local calls, using hundreds of low-cost or even unpaid SIM cards, which are often obtained with forged identities. These devices are also known as GSM gateways, since they mimic a mobile handset's SIM slot to trick the network into billing international calls at local rates. SIM box scams thus profit by exploiting the difference between local and international charges, paying only local rates— or none at all— to cell carriers after billing international rates at the source. The caller pays the high call rates, but the local telecom operator does not collect them, leading to revenue losses. This article explains how this fraud works, its business impact, and the modern methods used to detect and prevent it.
Although telecom scams are widespread globally, regions with high call termination costs attract fraudsters who take advantage of voice traffic routes and profit from them, often targeting MNOs. Hence,. interconnect bypass fraud is more rampant in the Falkland Islands, Seychelles, Cuba, Chad, the Maldives, Algeria, and the European Union, among many other regions.
How does SIM box fraud affect your business?
SIM box fraud and interconnect bypass fraud, have severe implications for businesses beyond the apparent revenue loss.
- Financial and revenue loss: Telecom operators bear the brunt of interconnect bypass fraud, which often goes undetected, leading to financial losses. Moreover, these scams evade government taxes and surcharges, depriving governments of revenue used to fund infrastructure and welfare schemes.
- Poor service quality: SIM box fraud uses cheap and substandard setups that affect call quality and service. This reflects poorly on telecom businesses' service quality standards, thereby damaging their reputation and customer trust and eroding their customer base.
- Damage to infrastructure: Overloading local networks affects the region's infrastructure. Moreover, such scams demotivate businesses, resulting in low or no investment.
- Compromised security and privacy: SIM box fraud compromises legitimate connections with privacy and security encryption, making information theft easier for hackers. Moreover, SMS messages, which are often used to communicate sensitive information via automated routes, lose all privacy and security.
- Threat to national security: SIM box frauds and interconnect bypass frauds escape legal intercepts by national security agencies, which track criminal activities. This becomes a significant security threat for the country.
How to detect and prevent SIM box fraud
The first step in protecting your business from potential losses is to have a fraud management system that can detect traffic rerouted through grey channels by stress-testing your network or undertaking real-time monitoring. In addition to making technical changes, having a strong legal team that can safeguard contracts with all stakeholders and collaborate with law enforcement agencies can help reduce the impact of fraud. Employing the latest forensic detection methods through reliable partners can reduce the incidence of fraud and improve the efficiency of your business. Powered by artificial intelligence (AI) and machine learning (ML), real-time, in-depth analytics can help you fight ever-changing interconnect bypass fraud, safeguard revenue streams, and improve customer experience Effective SIM box detection combines this kind of technical monitoring with strong governance and legal safeguards, rather than relying on any single method alone.
Key detection techniques:
1. AI and machine learning-powered analytics
The most effective weapon in modern telecom fraud management is Artificial Intelligence (AI) and Machine Learning (ML). These systems analyze massive volumes of Call Detail Records (CDRs) in near real-time to identify patterns that are impossible for humans to detect. They can flag suspicious activities such as:
- SIM cards with abnormally high call volumes for an individual user.
- Calls that consistently last for very similar, short durations.
- A subscriber identity making calls from multiple locations within an impossible timeframe. By learning the behavior of normal traffic, AI models can instantly spot anomalies that indicate a SIM box is active on the network.
2. Real-time network monitoring
Implementing 24/7, real-time monitoring of network traffic is essential. Automated systems can constantly probe the network, sending test calls from international locations to identify grey routes where traffic is being illegally terminated. When a test call is terminated locally instead of through the proper international gateway, the system can immediately identify and block the fraudulent SIM cards.
3. Implementing a proactive fraud management system (FMS)
A robust Fraud Management System (FMS) integrates all fraud detection techniques into a single, cohesive platform. Instead of reacting to fraud after losses have occurred, a proactive FMS provides:
- A centralized view of all network activity.
- Automated alerts for suspicious behavior.
- The ability to quickly block and deactivate fraudulent SIMs.
- Advanced reporting to understand fraud trends and adapt defenses.
For organisations on the digital transformation journey, agility is key to responding to a rapidly changing technology and business landscape. Now more than ever, it is crucial to meet and exceed organisational expectations with a robust digital mindset backed by innovation. Enabling businesses to sense, learn, respond, and evolve like living organisms, will be imperative for business excellence going forward. A comprehensive yet modular suite of services does exactly that. By equipping organisations with intuitive decision-making at scale, actionable insights based on real-time solutions, anytime anywhere experiences, and in-depth data visibility across functions that leads to hyper-productivity, Live Enterprise is building connected organisations that innovate collaboratively for the future.
How can Infosys BPM help?
The timely and continued use of the latest solutions can ensure the effectiveness of fraud management systems that address ever-evolving telecom fraud scenarios, including SIM box fraud and VoIP scams. With deep domain expertise, Infosys BPM offers three key services through its telecom fraud management solutions:
- Revenue Assurance and Fraud Analytics:We leverage our in-house RAFA platform and global team of analysts to analyze your call data in real-time, proactively identifying and stopping revenue leakage.
- Assessment Services & Automation: We assess your network's vulnerabilities and implement Robotic Process Automation (RPA) to automatically detect and block fraudulent SIMs faster than humanly possible.
- Digital Fraud and Revenue Assurance Operations: We provide an end-to-end managed service that integrates AI, ML, and our deep domain expertise to protect your revenue and improve customer experience.
Contact our telecom fraud experts today to build a robust defense against SIM box fraud.
Frequently asked questions about SIM box fraud
In simple terms, SIM box fraud is an illegal method where fraudsters use a device packed with hundreds of SIM cards to make expensive international calls appear as cheap local calls. This tricks the telecom network, allowing the fraudster to profit from the rate difference while the telecom operator loses significant revenue from international call termination fees.
It is challenging because fraudsters use thousands of SIM cards and constantly rotate them, a practice known as "churning," to avoid detection. They also mimic human behavior by spreading calls across many SIMs to ensure that no single card shows an obviously suspicious volume. This requires advanced analytics, such as AI and machine learning, to identify the subtle patterns of fraudulent activity.
The main financial impact is the direct and immediate loss of revenue from international call termination fees. Mobile Network Operators (MNOs) are not paid the correct, higher rate for these international calls because they are illegally terminated as local traffic. Over time, these losses can amount to millions of dollars.
AI and Machine Learning (AI/ML) are crucial because they can analyze millions of Call Detail Records (CDRs) in near real-time. Unlike manual analysis, AI models can instantly detect suspicious patterns—such as impossible call volumes or unusual call durations from a group of SIMs—that indicate a SIM box is active. This allows for the instant blocking of fraudulent numbers, minimizing financial loss.
SIM box fraud is a specific and very common type of interconnect bypass fraud. "Interconnect bypass" is the broader category for any method that illegally bypasses the official connection points between networks to avoid termination fees. SIM boxing is simply the technique used to achieve that bypass.
