Open Settings
Tap Wi-Fi
Tap the info icon next to the connected network
Tap Password
Authenticate with Face ID, Touch ID, or passcode
View or copy the Wi-Fi password
If you want a saved password from another network:
Open Settings
Tap Wi-Fi
Tap Edit in the top right
Authenticate with Face ID, Touch ID, or passcode
Tap the saved network
Tap Password to view it
If the network is shared from another Apple device:
Ask the owner to share the password from their device
Accept the shared password prompt on your iPhone