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Why do ussd codes or mmi codes not work for me??

(Topic created on: 01-10-2025 02:49 PM)
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guitargod
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Galaxy S
Hey guys I've been trying to get so many ussd codes or mmi codes to work on my phone.. they won't work no matterwhat I try.. can someone help??I use a galaxy s23 fe
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Helenna
Moderator
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Galaxy S

Hi guitargod,

If USSD codes also known as MMI codes aren't working on your Samsung Galaxy S23 FE, there could be several reasons for the issue. Here's a step-by-step guide to troubleshoot and resolve the problem:

Ensure the codes are correct: Double-check that you're using valid and network-supported USSD codes. Some codes are carrier-specific and may not work on all networks.

Ensure your phone has an active cellular connection. USSD codes require a proper connection to the mobile network.

Try a different SIM card: If possible, insert a SIM card from another carrier to see if the codes work.

Restart your phone. Rebooting can fix temporary glitches.

Boot your phone into Safe Mode to check if a third-party app is causing the issue:

  1. Power off your phone.
  2. Hold the Power button until the Samsung logo appears, then release it.
  3. Immediately press and hold the Volume Down button until the phone fully starts.
  4. You’ll see "Safe Mode" at the bottom of the screen.
  5. Test the USSD codes.

If the issue persists, consider performing a factory reset as a last resort, pleaseensure you back up your data.

https://www.samsung.com/ca/support/mobile-devices/back-up-and-restore-data-on-your-galaxy-phone/

https://www.samsung.com/ca/support/mobile-devices/reset-your-samsung-galaxy/

Thank you.

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Solution
Helenna
Moderator
Moderator
Options
Galaxy S

Hi guitargod,

If USSD codes also known as MMI codes aren't working on your Samsung Galaxy S23 FE, there could be several reasons for the issue. Here's a step-by-step guide to troubleshoot and resolve the problem:

Ensure the codes are correct: Double-check that you're using valid and network-supported USSD codes. Some codes are carrier-specific and may not work on all networks.

Ensure your phone has an active cellular connection. USSD codes require a proper connection to the mobile network.

Try a different SIM card: If possible, insert a SIM card from another carrier to see if the codes work.

Restart your phone. Rebooting can fix temporary glitches.

Boot your phone into Safe Mode to check if a third-party app is causing the issue:

  1. Power off your phone.
  2. Hold the Power button until the Samsung logo appears, then release it.
  3. Immediately press and hold the Volume Down button until the phone fully starts.
  4. You’ll see "Safe Mode" at the bottom of the screen.
  5. Test the USSD codes.

If the issue persists, consider performing a factory reset as a last resort, pleaseensure you back up your data.

https://www.samsung.com/ca/support/mobile-devices/back-up-and-restore-data-on-your-galaxy-phone/

https://www.samsung.com/ca/support/mobile-devices/reset-your-samsung-galaxy/

Thank you.

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