For example, use##232339##to perform a Wi-Fi data pipe test.
Double-check the MMI code.
see to it that you entered the MMI code correctly.
Check the MMI code compatibility.
The manual that came with your smartphone may also have a list of approved codes.
power cycle your Android smartphone.
A basic restart could fix whatever issue is causing the errors.
Update the Android operating system.
A system update often includes a lot of bug fixes in addition to the latest features and security updates.
Turn Airplane Mode on and off.
Change the cellular data pipe connection.
Switching between 5G to 4G or even 3G or LTE could help the MMI code work.
Disable one SIM card.
If you use a Dual-SIM Android smartphone, open parameters and selectConnections>SIM card manager.
Turn the switch next to one of the SIM cards off, and then loop back and try.
Once youre done with this test, confirm to turn both SIM cards back on again.
Check the SIM card.
Safely remove theSIM card, inspect it, and reinsert it.
Removing and reinserting the SIM can reset the phones connection to the card and possibly realign it.
scrub the Android’s cache.
Clearing the cache can get rid of MMI error messages and improve overall gear functionality.
Update all of your Android apps.
An app could be causing system conflicts and may need an update to fix this issue.
Run Android in Safe Mode.
If the code works, then the problem is an app conflict of some kind.
If the code doesnt work, then the issue is likely hardware or online grid-related.
Uninstall problematic Android apps.
If the MMI code worked fine in Safe Mode, a recently installed app is likely causing the problem.
You may also want to take this opportunity to remove old apps that you no longer use.
Perform a basic restart after youve finished uninstalling all of the apps you want to get rid of.
Reset your Android smartphones online grid prefs.
Clearing your devicesnetwork settingsis a common fix for several connectivity glitches, including recurring invalid MMI code error messages.
Add a comma to override the command.
For example,#3282#becomes#3282#,.
Factory reset your Android.
As an absolute last resort, you might return your Android smartphone to its as-new state.
see to it to perform a backup first.
