I have been reading many posts regarding iPhone 5 wifi issues. I have upgraded to iOS 6.0.2 but it looks like my iPhone 5 works properly with wifi only when cellular data is switched off. If the cellular data and wifi are both switched on, iPhone gets confusing, switching between 3G / WiFi, losing WiFi connection on screen lock, takes ages to reconnect etc. The above mentioned behaviour is the reason of quick battery drain. Anyone has similar issues? PS. For troubleshooting I did network settings reset, forget wifi network and even entering wifi details manually. Using WPA2.