Third generation services are widely used in Vietnam but cell phones are becoming the target of hackers.

When mobile phone users connect to 3G networks, it is the equivalent ofconnecting to a LAN network but without an administrator. Withtraditional networks, hackers try to gain access through modems, buttogether with security measures provided by ISPs, they generally blockhackers.

LAN networks are usually controlled by ITtechnicians with firewalls to prevent hackers from stealing informationbut 3G users do not have this security.

Nguyen MinhDuc, Director of BKIS Security says hackers can use regular 3Gsubscriptions to access other devices via Internet Protocol (IP) andexploit security vulnerabilities.

Duc says the 3Gnetwork in Vietnam does not have the standard configuration or safetybarriers to limit the risk of intrusion from hackers.

Viettel recommends that their clients should take the initiativethemselves by installing antivirus software, antispam and firewall.

Fake phone number annoy cell phone users

Most mobile service providers allow calls from internet basedtechnology. These calls connect through an ISP, sometimes located in aforeign country.

Vietnam's mobile service providershave addressed this problem by filtering calls generated from theinternet. In the case of internet calls, telephone number are displayedon the recipient's phone with national codes.

PhamDinh Truong, Deputy General Director of Viettel says they have adoptedmeasures to prevent fraudulent calls from abroad. Viettel also launchedits Message Plus system in August after a trial period in the CentralRegion./.