Status Icons

The icons in the status bar at the top of the screen give information about iPhone:

Cell signal icon
Cell signal:
Shows whether you’re in range of the cellular network and can make and receive calls. The more bars, the stronger the signal. If there’s no signal, the bars are replaced with “No service.”

Airplane mode icon

Airplane mode:
Shows that airplane mode is on—you cannot use the phone, access the Internet, or use Bluetooth® devices. Non-wireless features are available.

3G icon

3G:
Shows that your carrier’s 3G network is available, and iPhone can connect to the Internet over 3G. Available on “iPhone 3G” only.

EDGE icon

EDGE:
Shows that your carrier’s EDGE network is available, and iPhone can connect to the Internet over EDGE.

GPRS icon

GPRS:
Shows that your carrier’s GPRS network is available, and iPhone can connect to the Internet over GPRS.

Wi-Fi icon

Wi-Fi:
Shows that iPhone is connected to the Internet over a Wi-Fi network. The more bars, the stronger the connection.

Network activity icon

Network activity:
Indicates over-the-air syncing or other network activity. Some third party applications may also use this icon to indicate an active process.

VPN icon

VPN:
Shows that you are connected to a network using VPN.

Lock icon

Lock:
Shows that iPhone is locked.

Play icon

Play:
Shows that a song, audiobook, or podcast is playing.

Alarm icon

Alarm:
Shows that an alarm is set.

Bluetooth icon

Bluetooth:
Blue or white icon: Bluetooth is on and a device, such as a headset or car kit, is connected. Gray icon: Bluetooth is on, but no device is connected. No icon: Bluetooth is turned off.

Bluetooth Headset battery icon

Bluetooth Headset battery:
Shows battery level for the iPhone Bluetooth Headset when it’s connected.

Battery icon

Battery:
Shows battery level or charging status.

TTY icon

TTY:
Shows that iPhone is set to work with a TTY machine.

http://www.apple.com/iphone/tips/