iPhone 9

GSM Models of the iPhone use a SIM card to identify themselves to the GSM network. The SIM sits in a tray, which is inserted into a slot at the top of the device. The SIM tray can be ejected with a paperclip or the "SIM eject tool" (a simple piece of die-cut sheet metal) included with the iPhone 3G and 3GS.In most countries, the iPhone is usually sold with a SIM lock, which prevents the iPhone from being used on a different mobile network.

Liquid contact indicators

The iPhone is equipped with liquid contact indicators which change from white to red in color when they come in contact with water. These suggest whether water damage has affected the device. The indicators on the iPhone include a small disc which is located at the bottom of the headphone jack and with the iPhone 3G and all later models an additional one is located at the bottom of the dock connector.The indicators are often used by Apple employees to determine whether the device qualifies for a warranty repair or replacement. If the indicators show that the device was exposed to water, they may determine that the device is not covered by Apple. However, the liquid contact indicators may be triggered through routine use, and if a device is worn while exercising, the sweat from an owner may dampen the indicators enough to indicate water damage.On many other mobile phones from different manufacturers, the liquid contact indicators are located in a protected location, such as beneath the battery behind a battery cover, but the indicators on an iPhone are directly exposed to the environment. This has led to criticism of the placement of the indicators, which may also be affected by steam in a bathroom or other light environmental moisture.In response to these criticisms, Apple made a silent change to their water damage policy for iPhones and similar products. This new policy allows the customer to request further internal inspection of the phone to verify if internal liquid damage sensors were triggered.

Included items

All iPhone models include written documentation, and a dock connector to USB cable. The original and 3G iPhones also came with a cleaning cloth. The original iPhone included stereo headset (earbuds and a microphone) and a plastic dock to hold the unit upright while charging and syncing. The iPhone 3G includes a similar headset plus a SIM eject tool (the original model requires a paperclip). The iPhone 3GS includes the SIM eject tool and a revised headset, which adds volume buttons (not functional with previous iPhone versions).The iPhone 3G and 3GS are compatible with the same dock, sold separately, but not the original model's dock.All versions include a USB power adapter, or "wall charger," which allows the iPhone to charge from an AC outlet. The iPhone 3G and iPhone 3GS sold in North America, Japan, Colombia, Ecuador, or Peru include an ultracompact USB power adapter.