Samsung SGH-G618 User Manual page 80

troubleshooting
If you are having trouble with your mobile phone, try these troubleshooting procedures before contacting a service
professional.
While using your phone, the following messages
may appear:
Message Try this to solve the problem:
Please
Ensure that the SIM card is installed
insert SIM
correctly.
card
When the phone lock feature is enabled,
Phone lock
you must enter the password you set for
the phone.
a
Message Try this to solve the problem:
When using the phone for the first time or
when the PIN requirement is enabled, you
Enter PIN
must enter the PIN supplied with the SIM
card. You can disable this feature by
using the PIN check menu.
Your SIM card is blocked, usually as a
result of entering your PIN incorrectly
Enter PUK
several times. You must enter the PUK
supplied by your service provider.