Connected to wifi but unable to access the Internet

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Reasons for being unable to access the Internet when connected to wifi: 1. The broadband is in arrears or has expired; 2. The network cable is loose; 3. The device has been used for a long time; 4. There is a problem with the WiFi itself; 5. There is a problem with the router; 6. The router has turned on the timer Dial up; 7. The modem power is turned off; 8. The broadband DNS server cannot provide domain name resolution service for some reason; 9. The IP address obtained by the mobile phone is in an IP segment that prohibits access to the Internet.