1. Through mobile phone settings-WLAN-to be connected to the network-forget the password, enter the correct password and try again (check the "Show password" option when entering the password to see the entered password).
2. If the password is correct, please check whether the WiFi signal connected to the mobile phone is stable. If the signal is weak or unstable, you will be unable to connect for a long time. Please connect the WiFi with stable signal.
3. The router server sets restrictions, such as setting the filtering authority of MAC address or IP address, and limiting the connection time and number. You can contact the router administrator to handle these situations.
4. If you can connect normally before, please restart the router connection and try again.
5. Compare whether other mobile phones can normally connect to the same WiFi. If they can't connect, it may be a router setting or hardware failure.
6. If other mobile phones are connected normally, please back up the data of the mobile phone and restore all settings of the mobile phone before connecting to WiFi (enter Settings-General/More Settings-Restore Factory Settings-Restore All Settings).
7. If it still doesn't work, I suggest you go to our local after-sales service center to check your mobile phone: Go to Settings-More Settings-After-sales Service, and check the after-sales address.