You can ask the staff inside. In order to protect the security of networking, it is recommended not to connect password-free WiFi. At the same time, in order to prevent the emergence of phishing WiFi, ask the staff the correct WiFi name before networking. Or you can use Tencent mobile phone housekeeper to search for free wifi nearby, and the housekeeper will recommend the best connection for you. Check the security of wifi before connecting to prevent phishing.