Edited by Eng, VisiHow, senior Citizen, vc and 1 other
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.
If you have problems with any of the steps in this article, please post in the comments section below.
Categories : Samsung Galaxy
Recent edits by: vc, senior Citizen, VisiHow