You would now like to join a second device, like your Smartphone phone, to the same Wi-Fi but how do you discover out the password? You can also send a password request the Wi-Fi administrator or you can open the command prompt (CMD) on your computer and recover the saved password in one easy step. The technique for Windows PCs User.
Open the command prompt in admin mode. Type “cmd” in the Run box, right-click the command prompt icon and choose Run as Administrator. Now enter the following command and hit enter to see the Wi-Fi password.
netsh wlan show profile name=Get_Your_Own_Wifi key=clear
Remember to replace Get_Your_Own_Wifi with the name of your Wireless SSID (this is the name of the Wi-Fi that you connect your PC too). The password will show up under the Security Setting section (see screenshot).