atroubleshootingIf you are having trouble with your mobile phone, try these troubleshooting procedures before contacting a serviceprofessional.When you turn on your phone, the followingmessages may appear:Message Try this to solve the problem:Pleaseinsert SIMcardEnsure that the SIM or USIM card isinstalled correctly.Phone lockWhen the phone lock feature isenabled, you must enter the passwordyou set for the phone.PIN lockWhen using the phone for the first timeor when the PIN requirement isenabled, you must enter the PINsupplied with the SIM or USIM card.You can disable this feature by usingthe PIN lock menu.PUK lockYour SIM or USIM card is blocked,usually as a result of entering your PINincorrectly several times. You mustenter the PUK supplied by yourservice provider.Message Try this to solve the problem:

Samsung GT-S3830U User Manual