How Are Scam Calls Appearing As Local Numbers? | Talking Point

Scam Calls from Local Numbers: A Deep Dive into Tactics and Countermeasures

Key Concepts:

• Scam Calls: Fraudulent phone calls intended to deceive individuals for financial gain.
• SIM Box: A device used to send and receive a large volume of calls via multiple SIM cards.
• SIM Farm: A collection of SIM boxes used to automate scam call operations.
• GSM Gateway: Hardware connecting to local telecom networks, masking overseas calls as local numbers.
• SIM Card Mule: Individuals recruited to purchase and sell SIM cards to scammers.
• IMDA: Infocomm Media Development Authority, the regulatory body for telecommunications in Singapore.
• Plus 65 Prefix: The international dialing code for Singapore.
• Roaming Charges: Fees incurred when using a mobile network outside of its home country.

I. The Evolution of Scam Call Tactics

The video details the evolving tactics employed by scammers targeting individuals in Singapore. Initially, scam calls originated from easily identifiable overseas numbers. Scammers then shifted to using local numbers, initially appearing as overseas calls routed through Singapore, and now increasingly mimicking genuine local numbers without the +65 prefix. This evolution is driven by increased public awareness of overseas scam numbers, prompting scammers to adapt and disguise their origins. As stated by a representative from the Singapore Police Force, “If you look at the past one to two years, we see local numbers being used to scam Singaporeans. Actually, it has started from overseas phone numbers. Then he has actually progressed to plastics 5 because we have sent out a lot of police advisories.” This demonstrates a reactive adaptation by scammers to law enforcement and public awareness campaigns.

II. Case Study: Christina Hang’s Experience

Christina Hang’s experience serves as a compelling case study illustrating the sophistication of these scams. She received a call from a local number claiming to be from a well-known school, requesting a renovation quote and the purchase of mattresses. The scammer pressured her into contacting a supplier in Malaysia, offering a discounted bulk price and a $5,000 commission. Christina transferred $7,000 of her savings, only to discover the promised payment of $73,500 never materialized. This case highlights several key elements:

• Leveraging Trust: The scammer used the credibility of a well-known school to establish trust.
• Creating Urgency: The fabricated story about the principal’s dispute with the supplier created a sense of urgency.
• Exploiting Financial Vulnerability: Christina was motivated by the potential commission to alleviate financial pressures ("I really need the money in order for me to pay for my insurance premium, my HTB loan…").
• Emotional Impact: The scam left Christina feeling “very stupid” and emotionally affected.
• Limited Recourse: Despite filing a police report, recovery of the funds was deemed unlikely.

III. The Role of SIM Cards and Youth Involvement

The investigation reveals a critical component of the scam operation: the acquisition of Singapore SIM cards. While purchasing SIM cards is legal, it’s not anonymous – requiring official identification for registration. However, scammers circumvent this by exploiting youth, aged 15-17, to purchase SIM cards in bulk. These “SIM card mules” are enticed with quick cash, earning $10-$15 per SIM card, potentially making up to $100 for 10 cards. Recruiters, leveraging their relational skills, can earn significantly more, up to $1,000 per week. The video highlights the following:

• Easy Accessibility: SIM cards are easily transportable, allowing for smuggling overseas via air, land, or sea.
• Financial Incentive: The lure of fast cash is a primary motivator for youth involvement.
• Misinformation: Some youths believe they are not committing a crime by simply selling their identity.
• Escalation: Some SIM card mules become recruiters, expanding the network.
• Scale of Operation: Youths have been known to purchase 40-50 SIM cards per month.

IV. Technical Infrastructure: SIM Boxes and GSM Gateways

The segment filmed in Malaysia unveils the technical infrastructure enabling these scams. Scammers utilize SIM boxes – devices capable of housing multiple SIM cards (up to 400 in a “SIM farm”) – and GSM gateways.

• SIM Boxes: Automate call center operations, allowing scammers to make a large volume of calls simultaneously.
• GSM Gateways: Connect to local telecom networks, masking the origin of calls. This allows overseas calls to appear as local Singapore numbers, bypassing roaming charges and increasing the likelihood of being answered. As the cyber security expert explained, “They use this so that they can automate their call center operations. Simox connected to a computer where one single click they can simply communicate with the victims.”
• Dynamic Number Switching: Scammers use software to randomly dial numbers, switching numbers frequently to evade detection by law enforcement.

V. Regulatory Framework and Future Steps

Singapore currently limits individuals to three prepaid SIM cards across all telcos. However, the rules regarding post-paid SIM cards are less stringent, allowing up to 10 per telco. IMDA is actively reviewing these regulations, recognizing the need to tighten controls.

• Current Regulations: 3 prepaid SIMs across all telcos; 10 post-paid SIMs per telco.
• Proposed Changes: IMDA plans to significantly reduce the number of post-paid SIM cards allowed per user across all telcos.
• Data Monitoring: IMDA monitors data patterns from telcos and collaborates with law enforcement to identify suspicious SIM card registration activities.
• Enforcement Challenges: Tracing the flow of SIM cards and identifying the individuals involved remains a significant challenge.

VI. Statistics and Financial Impact

• Median Loss (2024): Approximately $1,400 Singapore dollars per scam case.
• Increased Losses (First 6 Months of 2025): Typical victims lost more than the median loss recorded in all of 2024.
• Cross-Border Operation Losses (April-June 2025): Exceeded $3.1 million Singapore dollars.

VII. Conclusion

The video paints a concerning picture of increasingly sophisticated scam operations targeting Singaporeans. The shift towards using local numbers, coupled with the exploitation of youth and the utilization of advanced technology like SIM boxes and GSM gateways, presents a significant challenge. While regulatory measures are being reviewed, a multi-faceted approach – including increased public awareness, stricter SIM card regulations, and enhanced law enforcement collaboration – is crucial to combat this growing threat. The key takeaway is that simply recognizing a local number as legitimate is no longer sufficient; vigilance and skepticism are paramount.