AndroidTech

How To Fix Connection Problem or Invalid MMI Code On Android Device

If you have an Android smartphone, you might see the message “Connection problem or invalid mmi code” that appears on your phone. This invalid MMI code message can mean that you won’t be able to send texts or make calls until you fix this problem. Below we’ll explain a few different ways to fix Android connection problem or invalid mmi code.

The main reason that you’re probably seeing the “Connection problem or invalid mmi code” message appears is because of problems from your wireless provider causing the SIM authentication error on your Android phone.

Below are a few different solutions to fix the connection problem or invalid mmi code on your Android smartphone. This will work for Samsung, HTC, Google, LG, BlackBerry, Nexus, OnePlus, Huawei and other Android based smartphones.


Restart the Android Device

The best solution for solving an invalid MMI code is to restart your phone. Then go into the network settings and hold the “Power” and “Home” buttons at the same time. Then your smartphone will turn off and vibrate. After that the phone will start to restart.


Modify the Prefix Code

Another option that could help solve the Connection Problem or Invalid MMI Code would be to add a comma at the end of the Prefix code. When you go and manually include comma, this will force the operation to execute and overlook any error.

  • If your Prefix code shows (*2904*7#), add a comma at just like this (*2904*7#,)
  • In addition, it’s possible to use the + symbol after * like this (*+2904*7#)

 

Activating  Radio and Turn on IMS over SMS

  1. Turn on your smartphone
  2. Open the Dial pad
  3. Enter in (*#*#4636#*#*)
  4. Go to Service mode
  5. Choose “Device information” or “Phone information”
  6. Choose Run Ping test
  7. Choose on the Turn Radio Off button and then the Galaxy will restart
  8. Choose reboot

 

Check Network Settings

  1. Turn on your smartphone
  2. Tap on “Settings”
  3. Choose “Network Connection”
  4. Choose “Mobile Networks”
  5. Choose “Network Operators” and pick your wireless provider in the search
  6. Connect again for another 3-4 attempts before it starts working again

 

After you follow the steps above, you’ll be able to fix the Connection Problem or Invalid MMI Code on your Android device. This will work for Samsung, HTC, Google, LG, BlackBerry, Nexus, OnePlus, Huawei and other Android based smartphones.

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