Samsung SCH-i920 User Manual page 67

Troubleshooting
Try this to solve the
Message
problem:
Your SIM card is blocked,
usually as a result of
entering your PIN
SIM card
incorrectly several times.
blocked.
You must enter the PUK
supplied by your service
provider.
Your device does not show a
signal (no bars next to the
network icon)
• If you just turned on the device, wait
about 2 minutes for your device to find
the network and receive a signal.
• You may not be able to receive a signal
in tunnels or elevators. Move to an
open area.
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• You may be between service areas.
You should receive a signal when you
enter a service area.
You forgot a security code, PIN, or
PUK
If you forget or lose this or another code,
contact the seller or your service
provider.
Your display shows white lines
The display may show white lines if you
have turned the device on after a long
period of disuse or if you removed the
battery without first turning off the
device. The display should correct itself in
a short time.