Samsung SGH D720 User Manual page 279

The display is not clear
• In direct sunlight, you may not see the display clearly.
Moving to a place with different lighting should solve
this problem.
White lines appear on the display
• This may happen if you turn on the phone after a long
period of disuse, or after removing the battery without
turning off the phone. This is not related to the
phone's life or performance. The display should
correct itself shortly.
"Locked" displays
• The automatic locking feature has been enabled. You
must press the
code before you can use the phone. To disable this
feature, go to
and set
SIM
"PIN code" appears
• You are using your phone for the first time. You must
enter the Personal Identification Number (PIN)
supplied with the SIM card.
• The PIN check feature has been enabled. Each time
the phone is switched on, the PIN has to be entered.
To disable this feature, go to
→
Security Phone and SIM
.
Off
"PUK code" appears
• The PIN code was entered incorrectly three times in
succession and the phone is now blocked. Enter the
PUK supplied by your service provider.
soft key and enter the lock
Unlock
→
Tools Settings
Autolock period
and set
Troubleshooting
→ →
Security
to .
None
→
Tools Settings
PIN code request
Phone and
→
to
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