Download the app - "WIFI HOTSPOT" - and create hotspots for your WiFi connection in mobile and share with people and use yourself for internet connection without knowing the WiFi passwords.
Simple steps are :-
1. Open WIFI HOTSPOT in the mobile where wifi is already connected.
2. Tap on create hotspot button.
3. Now, just open the app any other phone and just tap on Connect hotspot for using the WiFi's internet
It's that easy. Download and get started...