IPhone indicators are important as they tell you a lot about the health of the phone. They all appear on the status bar at the top of your iPhone screen. Using these indicators, you can find out how much battery power you have left, how good your signal is and whether you're receiving Wi-Fi coverage. You can also use the status bar to determine whether your iPhone is locked or not.
The battery indicator is at the top right-hand side of the status bar. When your battery has enough charge left, it is green but turns red when you need to plug it into a charger. The battery indicator also reveals whether the battery is charging and when it is fully charged. Once you plug your phone into a power source, a lightning symbol will appear in the battery indicator; this changes to a plug symbol once the battery is fully charged and you can disconnect the phone from the power.
The left-hand indicator on the status bar shows you how strong the signal is for your particular cell network. The more bars it displays, the stronger the signal. If you go out of range completely, the bars will be replaced by the words "No Service." When your iPhone is syncing with a mailbox or Web page over the network, you will see an animated symbol to the right of the signal bar that consists of bars arranged in a circle. This indicator might also appear if you are loading an app.
You can connect to the Internet in several different ways using an iPhone and the status bar shows you which connectivity options are available. When you are connected to a Wi-Fi network, you will see a series of rounded horizontal bars in a "V" shape. If 3G, EDGE or GPS is available, this symbol will be replaced by a "3G", "E" or a circular indicator. Two linked circles shows you are connected to a personal hotspot and are using the other device's Internet network to access the Internet.
The status bar can hold other indicators that will appear and disappear as you turn certain cell features on and off. A clock indicator shows you have an alarm set, while a right-facing arrow indicator displays when you are playing a podcast. An upward-facing arrow shows an app on your phone is using the iPhone's location service to track where you are. When Bluetooth is activated and you are connected to another device, a blue Bluetooth symbol will show to the right-hand side of the status bar.