6 Ways How To Fix Connection Problem Or Invalid MMI Code

Here at , we have many solutions to the problems of almost every mobile phone. Samsung Galaxy options are very popular, and we have written down some of the simplest and most useful solutions to various problems. While there are many common bugs on the Samsung Galaxy, one of the issues that really caught our attention and proved to be the most difficult was a connectivity issue or an invalid MMI code.

This is what the user says:

Hi,I’m having a communication problem or an invalid HMI code….. I cannot send or receive calls or text messages, and I cannot charge for call time.

This error usually appears when, for example, you want to check your balance, perform a reload or use a function of your mobile operator. B. adding a receipt to activate a USSD code.

What causes connection problems or an invalid HMI code.

Although mobile phone operators vary from country to country, the invalid MMI code error usually occurs on smartphones with two SIM cards, such as. B. with the Samsung Galaxy S Duos.

To resolve a connection problem or an invalid HMI code.



I mention this solution first because it has received less attention from users, but it is the simplest and most effective. Disable the application – many users have found the solution by removing the application that may be causing the MMI error code. For most people, however, this is not necessarily the case. To find out if an application may have caused this error, go into safe mode on your phone. In this guide, we will use the Samsung Galaxy.

What is safe mode?

Safe mode is very similar to computer safe mode. No applications are loaded. Basically, all preinstalled applications and services that came with the phone are temporarily disabled.

To switch to safe mode

Follow the instructions below to enter safe mode and find out if an intrusive application is interfering with your phone’s network. An application like FX Camera is a treat in most cases. However, to get into the secure mode :

  • Turn your phone off.
  • Press and hold the power button
  • Hold down the power button and keep pressing the menu button; this is the button to the left of the home button.
  • The Safe Mode logo will appear in the lower left corner of the screen.

Now it’s time to check it out.

  • Enter the same area code you tried before and see if it works, for example. B. *135#.
  • If it works, there is an app called Invalid MMI Code on your Android phone.
  • Restart the phone and delete recently installed applications.

Method 2

Another simple and effective way to fix a connection problem or an invalid MMI code on an Android phone is to add a comma to the end of the prefix code.

For example:

If your prefix code is *2904*7#, just add a comma to the end,


You can use the + symbol after * such as *+2904*7#.

Adding a comma forces the operation to execute and ignores any errors that get in the way.

Method 3

Please read: Secret codes for all Samsung Galaxy variants (S2/S3/S4/S5)

To resolve a connection problem or an invalid MMI code in the Samsung Galaxy, simply enter the device information mode and activate the radio to activate the IMS system via SMS.

To enter the information mode :

  • Dial *#*#4636#* on the phone.
  • Navigate to device/phone information
  • Click on the Perform Ping test button.
  • After performing the ping test
  • Press to switch off the radio.
  • Then click on the button Enable SMS via IMS.

IMS: IP Multimedia Subsystem
IP : Internet Protocol
SIP: Session Initiation Protocol

If this setting is disabled, SMS messages are sent or received for a 1x(time), circuit-switched connection.

Finally, a new beginning.

Method 4

Rebooting the phone a few times may help. Conclusion: Turn on the phone, open the network settings. Then press and hold the Power key and the Home key simultaneously until the phone turns off. Then turn it back on.

Method 5

On , there are always multiple ways to solve a problem, and here we have a collection of solutions, These links below are articles for different problems. Still, most of my users have found a solution by applying the same principle.

Please refer to these articles and follow the instructions carefully:

Method 5A: Correcting an invalid HMI code : Insert the SIM card to access network services

Method 5B: Correct an invalid MMI code or connection issue on your Samsung Galaxy S4.

BC method : Correct an invalid HMI code by restoring the IMEI number.

Method 6

Go ahead:

  • Parameters
  • Network connection
  • Mobile networks
  • Network operator, the search begins. You will then see the available networks. Select a service provider (at&t or Verizon, etc.).
  • If you have chosen one of these options and still encounter an invalid MMI code,
  • Plug it back in, it may take 4 or 5 tries before it starts working.

frequently asked questions

How do I solve a problem with an incorrect or invalid HMI code?

Restart your Android device The first way to try and fix an invalid MMI code is to restart your smartphone. If you go to network settings and then press the power button and home button at the same time until the phone turns off and vibrates, your smartphone will reboot.

How can I deactivate the HMI code?

The next steps are as follows: Dial *#*#4636#*# in dialect> navigate to phone information> click Perform Ping Test> after performing the ping test> click Disable Radio > now click Enable IMS via SMS. Finally, restart the phone. This should solve your problem.

What is an HMI code by phone?

(Man Machine Interface Code) A cell phone code that begins with an asterisk/dollar prefix (*#). MMI codes are entered like telephone numbers to obtain a variety of information and activate or deactivate various actions. If you z. B. *#06# for a GSM phone, the model and serial number are displayed (see IMEI).

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