Besides the problem of batter, it seems that the Firmware 3.0 leads to a serious decline in the WiFi signal, which occurs both on and on 3GS iPhone 3G. Even in this case I have to say that with regard to the WiFi signal, my iPhone 3G does not have any problem. Battery problem was resolved by disabling Push Notification in Settings. About WiFi problem many sites and forums filled up with no WiFi after upgrading iPhone OS3.0 Yesterday Apple updated their old article “Unable to use Wi-Fi or Bluetooth ...