Edited by Eng, VisiHow, senior Citizen, VC and 3 others
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.
- 1Press the home button.
- 2Tap on "Apps".
- 3Tap on "Settings"
- 4Tap on "Location and Security".
- 5Disable "Mobile tracker".
- 6In "Settings" > "Application manager", uninstall or disable Blacklist Call or similar applications (Calls Blacklist, Call Blocker).
- 8If nothing helps, then contact your carrier as advised in the error message.
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Categories : Samsung Galaxy
Recent edits by: Maria Quinney, DeleteQnA, VC