Sometimes smartphone owners are faced with the fact that a message appears on the screen of their mobile device: English“Connection problem or invalid MMI code” or in Russian “Connection problems or incorrect MMI code” on Xiaomi. This situation occurs if the user tries to send a short message, i.e. generate a USSD request. This means that it becomes impossible to connect/disconnect the service, switch to another tariff and use other services mobile operator.
The problem can be solved in several ways, which we will tell you about.
Changing settings and rebooting your phone
If an error occurs on the display, it is recommended to restart your smartphone. If after this action it is still impossible to generate a USSD request, then you need to go to “Settings” and select “On the plane”. You can also activate the mode by lowering the curtain on the main screen and selecting the desired option among the icons. After 10-15 seconds, you should deactivate the mode and check if the error remains.
Activating Safe Mode
If some application was recently installed, it could cause the device to malfunction. The best solution in this case is to enable safe mode. To do this, you need to turn off the device, and then hold down the volume down and power buttons for a few seconds. An image of a branded hare will appear on the screen and an inscription stating that the function we need is activated.
If information about an incorrect MMI code does not appear on Xiaomi, then you need to restart the phone and find the program that causes this error. Naturally, the found utility must be removed.
Checking the signal level
If the mobile operator signal is unstable, weak or absent, sending a request is not possible. The fact that the signal is too weak will be indicated by a change in information about the connected network on the display: either 3G, then EDGE, etc. In this case, you can try going to “Settings” - “SIM cards and mobile networks”.
In the window that appears, select the name of your mobile operator and indicate the preferred network type - 2G or 3G.
Roaming
It happens that a Xiaomi smartphone in another country is configured for coverage local operator, as a result of which sending requests to your network becomes impossible. You can use the above sequence of actions and select “ Mobile networks" Instead of automatically selecting a network, you should choose your operator. If this does not help, then all that remains is to contact the support service to clarify the issue.
A much less common situation is when the “Invalid MMI code” message on Xiaomi becomes a consequence of the SIM card not working. Only replacing it will help.
If, when you try to make a call, send an SMS or make a request for account balance, a message about a connection problem and an invalid MMI is displayed on the phone screen, then you should do simple manipulations to restore the connection. There is nothing complicated about them and even an inexperienced user can perform them.
MMI (Man-Machine Interface) code is used to generate USSD request from the keyboard of a mobile device. It starts with an asterisk and ends with a hash. When performing more complex queries within code, an asterisk is used to separate parameters.
We usually use such combinations when requesting information about balance, expiration date, when replenishing an account, etc.
Sometimes, when performing such a request, an error is displayed on the screen: “Connection problem or invalid MMI code.”
Below are some ways to resolve this error:
1. Problem with the SIM card
Like all electronic products, the SIM card is subject to physical wear and tear and may not function correctly. To correct the connection error, you must contact the service center to replace the card. However, the phone number will remain the same. It is recommended to replace the SIM card every 2 years.
2. Insufficient coverage or unstable 3G operation
Mobile operators are constantly improving their coverage capabilities and using third-generation 3G communications, but it does not always work as expected.
Modern telephone sets are also predisposed to modernization. For this reason, by default they use the option automatic connection to GSM/WCDMA. But with 3G connectivity interruptions, this network is not always stable.
To eliminate the error when there is insufficient coverage, you need to set the GSM network as follows:
- go to the phone settings;
- then go to the “Network” menu and select “Mobile networks”;
- in the “Network mode” setting, change the network mode to “GSM only”;
- reboot the phone.
This mode does not have to be changed permanently. After a while, try turning on the previous network mode again.
3. Some applications work
Some externally downloaded applications may cause an error with connection problems or an incorrect MMI code. To confirm or refute this suspicion, boot your device into safe mode and try to make a request to the operator. If it goes well, it means that some application installed on the phone is to blame and will need to be removed.
4. Problems with device settings
Incorrect device settings or malfunctions may cause problems with the MMI connection.
Try rebooting the device, and if the problem persists, try full reset data.
Go to “Settings” - “Backup and reset” - “Reset to factory settings”. Please note - all data on the device will be lost!
5. Temporary problems with the mobile operator
In this case, all you have to do is wait. You can call the operator and find out how long the error with MMI will persist.
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Users of phones and smartphones often encounter an error. Typically, this error appears when you try to make outgoing call, send an SMS message or USSD code. Below we will look at some simple methods that will fix the problem.
A few words about the MMI code itself. The MMI code is used to generate a USSD request from a mobile device. Such a request always begins with an asterisk and ends with a hash, for example, *100#.
Mobile operators have long begun to use USSD requests with different codes to perform actions on the phone number from which the request is sent. For example, using a USSD request, we receive information about the current balance and tariffs, send free messages asking to call back, etc.
The error “Connection problem or invalid MMI code” can occur for several reasons:
1. Outdated USSD request. If you enter a USSD request, make sure on the operator’s website that the request you entered is not outdated and entered correctly.
2. . Quite often, users, having connected communication services from an operator many years ago, forget that the SIM card is also subject to physical wear and tear. If your SIM card is more than two years old, contact the nearest store of your operator to exchange the SIM card for a new one. As a rule, this service is completely free.
3. Insufficient 3G/4G coverage. Unfortunately, in our country there is a significant lag in the development of mobile Internet. If large Russian cities already have high-speed 4G Internet, then in some regions mobile internet may be completely absent.
If you notice that the 3G or 4G network is working intermittently, periodically connecting to GSM/WCDMA, then all this may lead to the “Connection problem or invalid MMI code” error.
To resolve the error in this case, you need to disable 3G and 4G Internet for a while. You can do this in approximately the following way (the steps may vary depending on operating system, its version and model of your device):
1. Open menu "Settings" ;
2. Go to item "Data transfer" ;
operating room Android system has enormous functionality, and with each major update more and more features are added to users. At the same time, many errors may arise in the system that we, the users, will have to deal with. This article will talk about the error "Invalid MMI code" or " Invalid code MMI". A similar message may appear when sending a USSD request, for example when checking your balance.
The easiest way to fix the error
The easiest way is to reconnect to the mobile network. You can simply reboot your mobile device. If you do not want to turn off the device, then there is another way:
It is likely that such manipulations will correct the error with the MMI code.
Weak 3G or LTE signal
Another reason for the “Invalid MMI Code” or “Invalid MMI Code” errors may be a weak 3G or LTE signal. Due to poor network reception, a mobile device can constantly switch from one mode to another, thereby receiving various errors. However, the user can independently limit the speed by choosing the 3G operating mode or even 2G. This is done in the settings, section " Wireless networks» > Mobile Networks > Network Type.
