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4 Ways to Fix Connection Problem or Invalid MMI Code Error on Android

Last Updated on May 14, 2020 by Bestusefultips

When you dial any wrong number on your device, you can show the error connection problem or Invalid MMI Code error Android phone or tablet. This invalid MMI code error on Android phones is found on mostly dual SIM when USSD code running, sometimes one SIM card phone generated this error on different carriers such as AT&T, Sprint, T-mobile, Verizon, Vodafone (India), etc. This MMI code generated when dial number and running USSD code. You can see this error when dial the wrong number (*84536#), checking account balance or other payment via code, low signal network, SIM problem, and other reasons.

Read this:

How to Fix Connection Problem or Invalid MMI Code Error on Android Phone or Tablet

connection problem or Invalid MMI code android

Check Cellular Network settings (Android 7.0 Nougat)

Step 1: Go to “Settings”.

Tap more under wireless and networks section

Step 2: Under wireless & networks, tap on “More”.

Cellular networks on nougat phone

Step 3: Touch “Cellular network”.

Check cellular network settings nougat device

Step 4: Select your network operator to check it.

Also, change the preferred network type (4G/3G/2G), set access point, and enable data roaming using this cellular network setting.

Boot Android phone into safe mode

Step 1: Press & hold the power button on your phone.

View the “Power Off” screen.

Power off android nougat 7.0 phone

Step 2: Touch & hold the power off.

This message appears on the screen: Reboot to safe mode

Reboot to safe mode android 7.0 nougat phone

Step 3: Tap “OK”.

Safe mode symbol on android Nougat screen

Now enable safe mode on your android phone or tablet. You can see the “Safe mode” at the bottom left side screen on the phone.

Now check your device work perfectly in safe mode. If works without any problem, downloaded apps may causing a problem in the android device. One by one uninstall downloaded apps from the device. Check after every app uninstalls to phone working fine. To exit safe mode, restart your device.

If you will find the app that causes the connection problem or invalid MMI code error android device, delete it.

Restart your Android phone

Restart the android phone to fix the error, it may be working. If not work then turn on airplane mode, after 30-40 seconds turn off it and restart the device.

Solve Invalid MMI Code problem on Android to add coma/plus symbol

It is a very simple trick to solve Invalid MMI code error on your android device.

If your prefix code is *84536# just add the comma (,) symbol in the ending code (*84536#,).

If your prefix code is *84536# just add plus (+) symbol after star (*+84536#).

Now, check the fix error on your device.

End the list of possible solutions to fix connection problems or Invalid MMI code android phone. Do you have any alternative methods, please share it with us.

About Bestusefultips

I'm Arpit Patel, a techno lover from India. Bestusefultips is a technology website focused on the latest Android news, tricks & tips related to Android devices, tutorials and videos.

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