Fix networking problem in Korean version of S3

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==Questions and Answers==

=== USSD code running, and then shows a message Undefined additional service. Contact customer center? ===
'' USSD not active, and then shows a message Undefined additional service. Contact customer center. ''

Before you contact your carrier for assistance, try the tricks below.
# Press the home button.
# Tap on "Apps".
# Tap on "Settings"
# Tap on "Location and Security".
# Disable "Mobile tracker".
# In "Settings" > "Application manager", uninstall or disable Blacklist Call or similar applications (Calls Blacklist, Call Blocker).
# Lastly, [[Backup_Data_on_Samsung_Galaxy_S5|back up your phone data]] and [[Hard_Reset_Samsung_Galaxy_S3|hard-reset your phone]].
# If nothing helps, then contact your carrier as advised in the error message.

=== What procedure should I follow if my phone is Samsung note 5? ===
'' It shows "Undefine additional services.Contact customer center.",what procedure should follow because the producers given step 5 and 6 are available in Samsung note 5. My situation more less the same like other users by the procedure given cannot be applied to Samsung note 5. I have tried: I have tried to apply the procedure given for S4 with no success and also restarting the several times. I think it was caused by: A certain software in my phone is missing  because even if I change the SIM card the problem is still the same ''

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=== My mobile is ussd code was undefined aditional please help me? ===
''''' Please help me find a solution I very worried for my mobile '''''

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=== Error message of undefined additional services. Contact Customer Centre? ===
'' USSD running then a message of undefined additional services. Contact Customer Centre. ''

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[[Category:Samsung Galaxy]]

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