Turn Your Wifi Off! The other kind of high-speed network that the iPhone can connect to is Wi-Fi. Wi-Fi is even faster than 3G or 4G, though it???s only available where there???s a hotspot (not virtually everywhere like 3G or 4G). Keeping Wi-Fi turned on at all times in hopes that an open hotspot will appear is a sure way to drain your battery life. So, unless you???re using it right this second, keep Wi-Fi turned off. Find it in Settings -> WiFi -> Slide to Off