Four solution steps.
Step 1: Check whether the router in your home is turned on and whether the WiFi is faulty
First check whether the router is turned on to ensure that you are in the range of WiFi signal reception, if the distance is too far, it will not be connected. Then check whether the WiFi of your phone is turned on, open [Settings] -- [wireless LAN] -- make sure that the wireless LAN is already in the open state, and click the name of the WiFi you want to connect, if the connection is successful, there will be a blue checkmark on the left of the WiFi. If you click on WiFi and the \"auto join is disabled\" is displayed, you can click on this WiFi setting to \"auto join\". It may also be that your WiFi password is changed, resulting in WiFi connection is not available, if the display requires you to re-enter the password, enter the correct password. If it still shows \"can not join the network\" or \"password is incorrect\
The IPhone 11 is not connected to the WIFI phenomenon, which is generally caused by the discontinuous WIFI signal or weak WIFI signal when the phone is connected