On 17 Nov 2016, GSI collaborated with IMIC and Quang Ninh Provincial Police conducted unannounced inspections and simultaneously raided seven locations, including: Van Quan (Ha Dong), Luong The Vinh (Nam Liem), Phu Luong (Ha Dong), Dinh Cong (Hoang Mai), Chua Boc (Da) and Mong Cai (Quang Ninh). They discovered 08 Telecommunication Systems dedicated information for illegal switching Vietnam international inbound voice calls to domestic voice calls. Investigation Security Agency arrested four emergency teams, including: Nguyen Van Trinh was born in 1983 in Ha Dong (Ha Noi), Pham Ngoc Anh (ie Pham Cong Toan) was born in 1987 residing in Mong Cai city (Quang Ninh) ... that were directly involved in the installation and operation of illegal telecommunications system.

The investigation agency seized 12 mobile device transceivers (VoIP GSM Gateway) type Dinstar DWG2000 - 32G (32 channels / 1 device) by the Chinese manufactures, which equals to 384 international telecommunication channels, a long with many documents and exhibits related. As first investigation results, these crimes have linked up with foreign fraud players for installing small mobile broadcast and transceiver station. This is a virtual IP network which includes: Broadcasting system (VoIP GSM Gateway) server is connected to the system controller (SIM Server) in Hong Kong, host data virtual phone SIM (SIMBANK Server) in China, and the system VoIP server (SIP server) in the USA, South Korea ...

General Department of Security said the head of this fraud-group is Pham Cong Toan. In order to run this system, he collected prepaid SIM or inactivated SIM at some domestic provinces. Then his group transports to China and using illegal software to automatically register, create a virtual SIM, fake IMEI .... and using servers located in Hong Kong (global telecom hub), aiming to cut bandwidth renting costs. This criminal group method was buying SIM from Vietnam, then moving to China for loading into the SIM host server (SIMBANK). From then, they pushed data on the phone to the SIM server network controller (SIM Server) in Hong Kong.

In order to avoid detection of the Police and agency, these fraudsters have connected to Broadcasting and transcribing System in Vietnam to the host system in Hong Kong, China. And they regularly change the virtual SIMs (SIM loaded in SIM Server) system which connected to the different BTS in cities and provinces of Vietnam. These crimes took advantage of promotional domestic call packages of Vietnam telecom operators which allow subscribes call free for 10 minutes domestically. Then they will gain the illegal benefits from the difference between domestic price and international price.

Representative of the General Department of Security said that these fraud players have implemented the sophisticated technology, concealed tricks which are hard to detect. And this is the largest scale ever until now. Thus, tracking and destroying these crimes take a lot of time and effort.

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