Follow these steps to share wifi on iPhone:
- On your iPhone, go to Settings.
- Then, make sure Bluetooth is turned on by tapping it.
- Return to Settings and choose WiFi.
- Make sure your WiFi is turned on and that you’re connected to a WiFi network.
- Go to Settings on the iPhone that requires the WiFi password.
- Select WiFi.
- Select the same WiFi network as before.
- When asked, do not input the password.
- Go to WiFi on the iPhone that is already connected.
- On the pop-up box, tap Share Password.
- The password will be sent to the second iPhone, which will then be able to connect to the WiFi.