1. Go to the "Settings" on the phone, click "Mobile Service" option
OFCA appeals to members of the public to switch off the 2G function of their mobile phones to reduce the risk of receiving fraudulent SMS messages.
Fraudsters can exploit the security vulnerability in 2G network by transmitting radio signal via illegal radio equipment (commonly known as "fraudulent radio base stations") to induce nearby mobile phones connecting to it, and then send SMS messages luring mobile phone users to click on the hyperlink therein to disclose personal, banking account, and other sensitive information.
All mobile network operators in Hong Kong have already ceased to provide 2G services. At OFCA’s request, major mobile phone vendors have enabled switch-off of 2G function by default in their new mobile phones supplied to Hong Kong and make available software upgrade patches for switching off 2G function of existing mobile phones. Switching off the 2G function of mobile phones reduces the risk of receiving fraudulent SMS messages.
Members of the public should always stay vigilant when using telecommunications services, and must not disclose to unidentified senders any personal information, bank account numbers or credit card details, transfer money or access any hyperlink in the SMS messages under all circumstances, to avoid suffering any loss.
Switch off the 2G Function of Mobile Phones
Please follow the steps below to switch off the 2G function of mobile phones:
iOS System
1. Go to the "Settings" on the phone, click "Mobile Service" option
2. Click "Mobile Data Options" option
3. Click "Voice & Data" option
4. Confirm that the "2G" option has been turned off
Android System
1. Go to the "Settings" on the phone, click "Connections" option
2. Click "Mobile networks" option
3. Confirm that the "Allow 2G service" option has been turned off
Note: The setting may vary across different brands and models of mobile phones. If necessary, members of the public may contact mobile phone manufacturers, suppliers, or dealers to learn how to switch off the 2G function of their mobile phones.
Office of the Communications Authority