If the router's "lazy mode one-click setting" is used to configure the router's internet access parameters, and the encryption authentication method defaults to "automatic", there may be a problem that the mobile phone can connect to WIFI but cannot access the Internet. The default selection of WIFI encryption authentication type is "automatic", which leads to the problem that the default selection of WIFI encryption authentication type is "automatic". Solution to the problem: Since we know that the default choice of WIFI encryption type is "automatic", the solution is simple. Just manually select the WIFI encryption type as the safest and most reliable "WPA2-PSK". After restarting the router, all devices can surf the Internet normally.