Installing applications from unknown sources
Installing applications of unknown or unreliable origin can damage your phone. By default, your phone is set to block such installations. However, you can change this setting and allow installations from unknown sources.
To allow the installation of applications from unknown sources
1From the Home screen, drag 
upward.
2Find and tap Settings > Applications.
3Mark the Unknown sources checkbox.
Status bar
A status bar at the top of the screen displays phone status information and notifications. Notification icons appear on the left side of the status bar. Phone status icons appear on the right side. From the status bar you can access the notification panel.
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Phone status icons
The following status icons may appear on your screen:
Signal strength
No signal
Roaming
GPRS is available
EDGE is available
3G is available
Sending and downloading GPRS data
Sending and downloading EDGE data
Sending and downloading 3G data
Battery status
The battery is charging
GPS is activated
Flight mode is activated
A headset is connected
The Bluetooth function is activated
Connected to another Bluetooth device
The SIM card is locked
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