Fix networking problem in Korean version of S3

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.

1. 1
   Press the home button.

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2. 2
   Tap on "Apps".

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3. 3
   Tap on "Settings"

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4. 4
   Tap on "Location and Security".

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5. 5
   Disable "Mobile tracker".

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6. 6
   In "Settings" > "Application manager", uninstall or disable Blacklist Call or similar applications (Calls Blacklist, Call Blocker).

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7. 7
   Lastly, back up your phone data and hard-reset your phone.

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8. 8
   If nothing helps, then contact your carrier as advised in the error message.

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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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See more questions like this: What does this message means, undefined additional service contact customor center?

How do you fix the problem of "Undefined additional services?

Am failing to check balance it is writing tthe same please help me to solve the problem I will appreciate it

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If you have problems with any of the steps in this article, please ask a question for more help, or post in the comments section below.

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