A Malaysian electrician looking for extra income has found himself at the centre of a sophisticated scam operation that siphoned more than S$1.6 million from victims in Singapore in a matter of weeks.

Chong Wei Hao, 42, was sentenced to five years and three months in jail after pleading guilty to his role in setting up a covert telecommunications hub used to blast out thousands of fraudulent calls. What began as a job search on Telegram evolved into a cross border scheme involving rented property, specialised hardware and remote operators likely based overseas, according to reporting by the South China Morning Post.

Chong, a freelance electrician with 15 years’ experience, was approached by a user known only as “Nasa” and offered a modest monthly salary along with an upfront payment in cryptocurrency. In return, he was instructed to travel to Singapore, rent a flat and carry out technical installations. He agreed, making multiple trips in early 2025 to secure a unit in Chai Chee under false pretences.

He told the landlord he was managing a dim sum business and needed accommodation for staff. Instead, the flat was fitted out with high speed internet, reinforced locks and surveillance cameras. Inside, Chong installed a series of VoIP GSM gateway devices, equipment designed to route internet based calls through local mobile networks.

The setup allowed operators outside Singapore to make scam calls that appeared to originate from local numbers, increasing the likelihood that targets would answer. Calls were routed through offshore SIM pools before being transmitted through the devices in the Chai Chee flat, masking their true origin and making them harder to detect or block.

Chong installed nine such devices and maintained them, testing connectivity and optimising signal strength. He had carried out similar work in Johor Bahru earlier that year and was aware the system was being used for scams and other illegal activities. Prosecutors said he participated for financial gain.

The scale of the operation was significant. In a single 50 minute window, the devices transmitted more than 50,000 call sessions targeting around 18,000 phone numbers. Dozens of those numbers were later linked to police reports. Victims were subjected to automated messages impersonating government agencies and financial institutions, with some persuaded to transfer large sums of money.

Over a period of less than three weeks, losses exceeded S$1.6 million. In one case, an elderly retiree lost thousands after being duped by a caller posing as a government official. Much of the stolen money has not been recovered.

Police raided the unit in April 2025, seizing the devices and related equipment. Chong was arrested in Malaysia two months later and handed over to Singapore authorities. His defence argued he was not directly involved in the scams themselves, but the court found the harm caused was substantial and the operation highly organised.

The case offers a rare look into the infrastructure behind modern scam networks. Rather than relying solely on deception, these operations are built on layered systems that exploit telecommunications technology, jurisdictional gaps and individuals willing to carry out on the ground tasks.

For investigators, it underscores how difficult these networks are to disrupt. For everyone else, it is a reminder that the machinery behind a single phone call can span multiple countries, and that those enabling it are not always who you might expect.