If USSD codes are not running on your Android device, the problem can be caused by settings on your device, network issues, carrier restrictions, or errors known as “Invalid MMI code.” Here are several proven solutions you can try:
- Restart Your Device: Hold the power button and select “Restart.” This simple step often resolves USSD issues by refreshing system processes[1][2].
- Reboot in Safe Mode: Power off your device, then turn it on while holding the volume down button until “Safe Mode” appears. This will help determine if a third-party app is interfering with USSD functions[1].
- Enable and Disable Airplane Mode: Go to Settings > Connections, enable Airplane Mode for about 10-30 seconds, then disable it. This action resets cellular connections and often clears USSD errors[1][2][4].
- Check “Auto Blocker” Setting: On some Samsung devices, go to Settings > Security and Privacy > Auto Blocker. Turn off Auto Blocker, which may block USSD code execution. Beware that disabling this feature could lower your security; review its description first[3][7].
- Reset Network Settings: Open Settings > General Management > Reset > Reset Network Settings. Confirm the reset; your phone will restart, which may resolve connectivity issues blocking USSD codes[4][5].
- Modify the USSD Prefix Code: Some codes may work if you add a comma at the end (e.g.,
*#06#becomes*#06# ,) or use a plus sign (e.g.,*#06#becomes*+#06#). This can force the request to execute[2][4]. - Confirm Carrier Support: As USSD support varies by carrier, contact your mobile service provider to check if USSD codes are still supported on their network. Some carriers have phased out USSD functionality[6].
- Switch SIM Slots or Try Another SIM: Move your SIM card to the alternate slot or test another SIM to determine if the issue is SIM-related[5].
If none of the above resolves your problem, there may be network outages, SIM card faults, or the need for a full system reset. Note that some USSD codes are also region or network specific; if friends with the same phone but a different network are unaffected, your mobile provider is likely responsible[5].
References
- [1] Fix Connection Problem Or Invalid MMI Code Error On Android
- [2] How to Fix Connection Problem or Invalid MMI Code on Android
- [3] USSD codes disabled – Samsung Community
- [4] Common problems and solutions while executing the USSD – Fonbnk
- [5] USSD / MMI CODES NOT WORKING – SMARTY Community
- [6] Ussd does not work – Samsung Galaxy Note 20 Ultra 5G – iFixit
- [7] USSD codes are not working. – Samsung Community
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