In social gatherings, criminals may use the following hidden means to steal personal information from mobile phones. We should be vigilant.： 1. **Pseudo-public Wi-Fi** -Set up a free Wi-Fi with a name similar to a meeting place to monitor traffic or implant malware after inducing a connection. 2. **Bluetooth/NFC concealed attack** -To steal data through Bluetooth scanning (such as Bluejacking) or short-range NFC, you need to ensure that the phone is not detectable. 3. **Malicious charging station** -Modify the charging interface or cable (such as "Juice Jacking”) to automatically transmit data or install spyware after connection. 4. **Fake QR code** -Overwrite the malicious QR code on the promotional materials, and after scanning, jump to the phishing website or trigger the download. 5. **Physical contact.** -When you touch the phone for a short time, quickly insert a hardware tool (such as a USB key) to copy the data, or enter the unlock password. 6. **Social engineering methods** -Pretend to be a staff member and ask for mobile phones to "assist in debugging”, or induce the sharing of sensitive information through games. 7. **Sonic Attack** -Use ultrasonic signals (such as “ultrasonic cross-device tracking”) to activate voice assistants to execute malicious instructions. **Protection recommendations**： -Use mobile data/VPN to avoid public Wi-Fi; turn off BLUETOOTH/NFC; bring a power bank; manually enter the URL; turn on the biometric lock; check the application permissions regularly. If you find suspicious behavior, you should immediately disconnect from the network and call the police. National Security Agency reporting hotline: 12339. Maintaining the security of personal information is the responsibility of every citizen.