Sometimes users encounter various kinds of problems that arise when using smartphones based on operating system Android. Today we will look at the “Connection problems or incorrect MMI code” error. It can occur when trying to make a call, send an SMS message, or even when requesting a USSD command.
MMI or Man-Machine Interface is the code used when generating USSD requests, but occasionally a failure occurs, which leads to the error that we are discussing in this article.
The error itself looks something like this:
The error may also appear on English language: Connection problem or invalid MMI. The essence of this, however, does not change.
Now let's talk about solutions that will hopefully help you deal with the problem.
Reboot your device
The very first and simplest thing to do in case of such problems is to restart your smartphone. For what? It happens that some kind of glitch occurs software, which causes an error to occur. And a reboot in many cases allows you to cope with this (and not only) problem.
Turn on airplane mode
An option that sometimes helps you avoid rebooting your smartphone is to turn on and then turn off airplane mode (sometimes called “Airplane mode”). As you know, in this mode, any data transmission is suspended, and after shutdown, it is turned on again. In this simple way you can try to get rid of the error.
Disable the "Add country code" feature
A solution that has helped a huge number of users: the country code is automatically added to the number, which in turn can lead to the described error. We will show an example of disabling functionality based on a Xiaomi smartphone.
Open “Settings”.
Tap on the section with system applications. Sometimes system applications can be found in the main “Applications” section, for which, as a rule, you need to click on the menu button somewhere at the top of the screen, and then select “Show system applications” in the menu that appears. In our example, this section is placed separately.
Find the “Phone” or “Calls” application and tap on it.
Click "Contact Locations".
Move the "Add Country Code" switch to the "Off" position by simply clicking on it.
After that, try making a call or sending a USSD request.
Change network type
Go to settings, select the “SIM cards and mobile networks” section.
Click Preferred Network Type.
Change the network type.
Usually this is 3G or 4G, but not lower, although you can try, for example, turning on 2G, and then 4G again.
Select operator network
Go back a step and select “Mobile networks”.
Make sure your current network is automatically selected, for example:
If not, then change it, fortunately this can be done through the settings.
Add a character to the number or USSD request
Users write that sometimes a non-standard option helps - adding a symbol to the phone number or USSD code. This could be, for example, a plus sign:
Remove and reinsert the SIM card tray
Another option that may help is to remove the SIM card tray: remove it and put it back in.
Make sure the SIM card is working
To do this, use another phone or smartphone. If an error occurs in this case, the problem is most likely with the SIM card; it needs to be replaced. If everything is fine, the problem may be with your phone. Alternatively, you can reset all data.
Everyone who has mobile phone android, encountered a pop-up window when typing USSD command: "invalid MMI code." There are different interpretations of the message, but they have one thing in common - the MMI code. What does the mysterious message mean: connection problems or incorrect Tele2 MMI code?
MMI is a connecting code between the subscriber’s USSD request and the operator’s service application. It is sometimes formed incorrectly and an error appears, which is visible on the screen in the form of a corresponding message.
Causes
Problems in code generation occur for various reasons: gadget breakdown, user inattentiveness when entering USSD numbers, breakdowns on the server of the service company. The first two points can be corrected by the user himself; we will analyze them further.
What to do, connection problems or incorrect mmi code Tele2 on Android
There are a lot of ways to overcome problems, at least one will work. Most often, a connection problem occurs due to the subscriber’s own carelessness and entering unnecessary invalid characters in the request or invalid commands.
Send the USSD command again
The most common command among users is checking the balance using *100#. Did the phrase “faulty MMI Tele2 code” appear as a result of checking your account? You need to check the connection, if everything is fine with it, then send the request of interest several times with an interval of 5 minutes. If this does not help, you should contact your operator to rule out the possibility of problems with the service company.
Turn airplane mode on and off
A useful key in every Android is airplane mode. When enabled, all communication capabilities on the device are disabled. After disabling the mode, you need to enter the desired USSD request again.
If the operation of the gadget is prevented by a failure in its system, then you need to reboot or turn it off and on, then check for an error.
Network type changes
Today there are network types: 4G, 3G, 2G. You need to try switching to another type in order to eliminate the error. In the settings you need to find the “Mobile networks” section and in “Network mode” select a different type than the current one. Next, dial USSD; if there is no error, you can return to the previous network type.
Operator network check
It happens that the device is configured by an unnecessary operator. To check the settings, you need to go to “Mobile networks”, to the “Network Operators” section and select the desired telephone company. Manipulation will help, especially if there is roaming.
Often additionally downloaded applications interfere with the normal operation of the phone. To disable all applications and leave them running only system settings need to install " Safe mode" It will allow you to find out whether they are interfering third party programs functioning of the smartphone.
To turn on the mode in most phones, you need to hold your finger on the “Power” button for several seconds. Next, a sign will appear indicating the transition to safe mode or the smartphone will immediately turn off. When turned on, there will be a “Safe Mode” mark at the bottom of the screen. In the mode, you need to type the command of interest and see if the smartphone begins to work better.
To reset the mode, the phone must be rebooted.
Problems with SIM
A faulty SIM card can cause an MMI code error to appear. The card may be old, worn, or improperly cut. Only replacing it with a new one will help. The service is provided free of charge in any service center operator.
If the above methods do not help resolve the problem, all you can do is contact your telecom operator for help; perhaps the problem is not yours, but the service organization’s.
Many owners of gadgets with Android OS saw a notification that there were connection problems when typing the USSD code. In today’s publication, we’ll look at what the mmi code is and why such errors occur. By the way, the special code itself is needed for formatting ussd requests. These messages may appear regardless of the operator used. But first of all, you should check whether the data is entered correctly. The entire list can be found on the provider’s website. If everything is entered correctly, but the error still occurs, read the instructions below.
What is mmi code? If the problem occurred for the first time, then most likely there was a network failure. In this case, use simple method. To do this, go to settings and tap on the airplane icon to activate airplane mode to completely turn off the network.
Then you need to wait a little, about 30 seconds, and you can deactivate it. Then try entering the request again; if the mmi special code is canceled again, you will have to try other options.
Unstable 3G or LTE operation
This failure may occur if the signal level is poor. This will be visible on the network icon; if the type changes there, this will lead to failures in requests. To correct you need to select one network type, you will find them in the settings section. There, click the “More” icon, then go to mobile networks, the required item is there. You can try the available options one by one, it all depends on the coverage of your region.
What is an mmi code: checking a SIM card
This problem is the most common one if you are looking for an answer to the question of what does an invalid mmi code mean. Most likely, your SIM card has been in use for a long time or it was recently moved from one device to another and was damaged.
In this case, try to remove the SIM card from the device and wipe it with alcohol or an eraser; this can also be done with telephone contacts, if you have access to them. If the result is negative, you need to take your passport and go to the operator’s salon. They will quickly replace you.
Nothing helps
If you can’t fix the situation, you can use additional tips. They may not help, but they still sometimes helped users out, so try:
- Add a comma at the end of the query, even if it shouldn't be there;
- Go to settings, to the calls item and the location section, disable the default country code;
- If the error appears after installing the software, try removing them and trying again;
- If you are outside your home region, then perhaps the smartphone was connected to another provider or specific commands are not supported on this network. Please immediately clarify this point with the support service.
What is mmi code? As you understand, this is a special code used to generate requests and ensure interaction between service programs operator and subscriber. If an error occurs, try the instructions above. Good luck!
USSD requests greatly simplify interaction with mobile operator. But sometimes glitches occur, leading to errors like “Invalid MMI code” on Android. What to do in such situations is described in this article.
Reasons for the error
A USSD request is a digital code sent to the operator’s servers, which returns the result in the form of a message with the requested information. These combinations are used to check the account balance, tariff plan and so on.
Factors influencing the occurrence of the error:
- Incorrect code;
- network problems;
- smartphone system failure.
Solution options
Before following the instructions, make sure you enter the correct code that is available to your operator.
Note! On some smartphones, the problem is solved by adding a symbol to the USSD code being dialed. For example, “*100#,”. To add a comma, press the “*” button, and to add a semicolon, press the “#” button.
Enabling Airplane Mode
The likely cause of the problem is a network problem. To reconnect to it, you need to turn airplane mode on and off.
Note! The instructions are applicable to Andoid 6.0 and MIUI 9 shell. In other versions of the software, the names of menu items or their location may differ.
Also for quick access to mode, hold down the power button until the shutdown menu appears → select “Flight”.
Rebooting the smartphone
If manipulating the airplane mode does not solve the issue, you should restart the device.
Wait for the phone to boot and check that the USSD request has been sent.
Changing the network type
Poor signal level affects the appearance MMI errors and depends on the default network type.
Replacing the SIM card
The SIM card needs to be replaced if it is outdated and does not meet the new standards. This is also necessary in case of physical damage (even minor). To do this, visit your operator's office with your passport and ask to replace it. This procedure is quick and free.
conclusions
The appearance of an error reporting an incorrect MMI code is due to several reasons. You should reconnect to the network using Airplane mode or reboot the device, change the network type, or add a character to the USSD code you send. As a last resort, you need to replace the SIM card.
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