There is always a sketch sound on the mobile phone and even WIFI.

The reasons and solutions of wifi connection failure are as follows;

1.WiFi password error, unable to connect, no need to enter the correct password.

2. If the mobile phone network settings fail, restore the default network settings and then connect.

3. When 3.wifi is connected, you can't surf the Internet. It is because there is no network signal in WiFi or the network cable is unplugged. Just plug in the network cable.

4. Mobile phone hardware failure makes it impossible to go online to the mobile phone shop or after-sales inspection and maintenance.