Keep your iPhone off the heat. It works best from 32° to 95° F Update your iPhone with the latest firmware (unless you’re a jailbreaker) Turn off wifi if you’re not using it (Settings > Wi-Fi and set Wi-Fi to Off) Turn off 3G if you don’t need it (Settings > General > Network and set Enable 3G to Off) Turn off song EQualizer (Settings > iPod > EQ and tap Off) Turn off Bluetooth (Settings > Gener..