The router is faulty. Please check whether the computer with a wired connection can be used normally, because sometimes even if the WIFI signal is displayed, it does not mean that the broadband is normal. If the wired computer is no longer available, re-check whether the broadband line is faulty.
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If the mobile phone is not compatible with the wifi network, it is recommended to reset the wifi network and modify the encryption mode and try again.
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Or maybe the WiFi password has been changed, and the computer has used the new password to connect, but the phone has not.
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The correct sharing network is not selected. Apple phones and Android phones are different, Android phones can only use wpa2 mode.
Mobile phone firmware problem.
2. wifi parts need to be repaired.
3. Router Settings are incorrect.
4, the phone wifi setting is wrong.
solution
1. Erase and restore all previous wifi Settings.
2. Turn on the wifi option.
3, there is a blue arrow next to many wireless networks, click the blue arrow and then click Ignore this network.
4. Return to the home screen to shut down and restart the phone.
5. After restart, enter the wifi setting page for wifi setting.
6. Reset the router.
7, go to the mobile phone repair point to check whether the mobile phone wifi parts are damaged.