Very often, owners of Android smartphones, in the process of using the gadget, periodically encounter an incomprehensible error. The device displays a message on the display: “Connection problem or invalid MMI code”, which in Russian means “Connection problems or incorrect MMI code”. The MMI (Man-Machine Interface) code is required to generate USSD requests.
Manipulating settings and rebooting
by the most in a simple way one that may still work is to restart the Android smartphone. If after it the situation with the appearance of the error has not changed, we try to fix it using the settings. To do this, go to the appropriate section of the menu, turn on the “Airplane” mode, give the device 5-10 seconds to reconfigure, after which we turn off the flight mode and check the result.
It may also be that the problem is caused by one of the recent installed apps. Check this will allow loading the smartphone into safe mode. Turn off your smartphone. Press the power button and hold down the "Volume -" rocker, holding it until the manufacturer's logo stops showing on the screen and an inscription appears that the device has booted in safe mode. Check if the error has disappeared (if it has disappeared, you will have to spend some time searching for an application that interferes with normal operation device to remove it).
Change the request code
Another simple way, which is to supplement the request with a regular comma. For example, a request for the status of an account on Megafon will look like this: * 100 #,. To put a comma, you need to hold down the * button.
Weak signal strength
If the signal strength is weak or unstable, the smartphone is looking for a stable signal, constantly changing the network format - 4G, 3G, WCDMA, EDGE. You will have to go in the direction of lowering the speed by going to the settings (“Settings” -> “More” -> “ Wireless network» -> « Mobile networks» -> «Network Type») and forcibly selecting 3G or even 2G.
Another operator selected in roaming
A fairly common situation that the user may not notice until he needs to send a USSD request: an Android smartphone has tuned in to the coverage of another operator. Go to the settings and select from the available networks the coverage of your mobile operator manually. If it didn't help, then perhaps where you are, given request not supported. Contacting support will help you figure this out.
SIM card status
Perhaps it was cut, moved many times from one apparatus to another, or something else. The shabby appearance of the card, although it does not always indicate microcracks inside, is the reason why there is a reason to replace it without waiting for serious communication problems to arise at the most inopportune time.
Send USSD request again
Let's say that you decide to find out the account balance by sending a request *100#, as a result of which you receive an error, you do not observe communication problems. Try sending the USSD request again, and after a while, if it doesn't help, try again. Perhaps this is a problem on the side of the carrier.
Then send a USSD request. Most likely, everything will work.
Restart your smartphone
In general, switching on and off the flight mode should be enough to solve communication problems. However, perhaps the problem is in the software of the smartphone - let's say there was some kind of failure. In order to return the device to its previous form, simply reboot it. Or turn it off and on again - whichever is more convenient for you.
After turning on, check the device for an error.
Put your phone in safe mode.
Sometimes third party applications may affect some processes in the device. To determine whether a "foreign" program is to blame or not, you need to go into safe mode. First, hold down the power button on your phone. Then, in the menu that opens, hold your finger on the "Shutdown" item.
You will see a dialog box informing you about the transition to safe mode. After clicking "OK" your phone will be started. It will only contain system programs. Therefore, you will be able to determine if a third party is to blame software or not.
Sometimes smartphone owners are faced with what is on the screen mobile device a message appears on English language“Connection problem or invalid MMI code” or in Russian “Connection problems or invalid MMI code” on Xiaomi. This situation occurs if the user tries to send a short message, ie. generate a USSD request. This means that it becomes impossible to connect / disconnect the service, switch to another tariff and use other services of a mobile operator.
The problem is solved in several ways, which we will tell you about.
Change settings and restart your phone
If an error occurs on the display, it is recommended to restart the smartphone. In the event that after this action it is impossible to generate a USSD request again, then you need to go to "Settings" and select the item "On the plane". You can also activate the mode by lowering the curtain on the main screen and selecting among the icons desired option. After 10-15 seconds, you should deactivate the mode and check if the error remains.
Activating Safe Mode
If some application was recently installed, then it could cause the device to malfunction. The best option The solution in this case is considered to be the inclusion of safe mode. To do this, turn off the device, and then hold down the volume down and power buttons for a few seconds. An image of a branded hare and an inscription stating that the function we need is activated will appear on the screen.
If information about the wrong MMI code on Xiaomi does not appear, then you need to restart the phone and find the program that causes this error. Naturally, the found utility must be deleted.
Signal Strength Check
If the signal of the mobile operator 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 the display of information about the connected network: either 3G, or EDGE, etc. In this case, you can try to go to "Settings" - "SIM cards and mobile networks".
In the window that appears, select the name of your mobile operator and indicate the preferred type of network - 2G or 3G.
Roaming
It happens that a Xiaomi smartphone in another country is configured for the coverage of a local operator, as a result of which it becomes impossible to send requests to its network. You can use the above sequence of actions and select the "Mobile networks" item. Instead of automatically choosing a network, you should choose your operator. If this does not help, then it remains to contact the support service to clarify the issue.
Much less common is the situation when the message “Invalid MMI code” on Xiaomi becomes a consequence of the inoperability of the SIM card. Only its replacement will help here.
operating room android system has a huge functionality, and with each major update, more and more features are added to users. At the same time, many errors can occur in the system, which we, the users, will have to deal with. This article will focus on the "Invalid MMI code" or "Invalid MMI code" error. A similar message may appear when sending a USSD request, for example, when checking the balance.
The easiest way to fix the error
The easiest way is to reconnect to the mobile network. You can simply restart 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 fix the error with the MMI code.
Weak 3G or LTE signal
Another cause of "Invalid MMI code" or "Invalid MMI code" errors can be a weak 3G or LTE signal. Due to poor network reception, the mobile device may constantly switch from one mode to another, thereby receiving various errors. However, the user can independently limit the speed by selecting the 3G mode or even 2G. This is done in the settings, section "Wireless networks"\u003e "Mobile networks"\u003e "Network type".
Everyone who has a mobile android phone, encountered the pop-up window by 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 MMI Tele2 code?
MMI - connecting code between the USSD request of the subscriber and service application operator. It is sometimes formed incorrectly and an error occurs, which is visible on the screen as a corresponding message.
Causes
A problem in generating the code occurs for various reasons: gadget breakdown, user inattention when entering the USSD number, breakdowns on the server of the service company. Correct the first two points by force to the user himself, and we will analyze them further.
What to do, connection problems or incorrect mmi Tele2 code on Android
There are a lot of ways to overcome problems, at least one, but it will work. Most often, the connection problem occurs due to the subscriber's own inattention and entering extra invalid characters in the request or invalid commands.
Send USSD command again
The most common command among users is to check the balance by *100# . Did the phrase "faulty MMI Tele2 code" appear as a result of checking the account? You need to check the connection, if everything is in order with it, then send the request of interest several times with an interval of 5 minutes. If this does not help, you should contact the operator to exclude the possibility of a malfunction with the service company.
Turn airplane mode on and off
A useful key in every Android is flight mode. Turning it on disables all communications on the device. After disabling the mode, you need to enter the USSD request of interest again.
If the operation of the gadget is hindered 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 the "Network mode" select a different type than the current one. Next, dial USSD, if there is no error, then you can return the previous network type.
Operator network check
It happens that the device is configured to the wrong 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 in the presence of roaming.
Often additional downloaded applications interfere with the normal operation of the phone. To disable all applications and leave only working system settings you need to install "Safe Mode". It will allow you to find out if they are interfering third party programs smartphone operation.
To turn on the mode in most phones, you need to hold your finger on the "Shutdown" button for a few seconds. Next, a sign will appear showing the transition to safe mode or the smartphone will immediately turn off. When turned on, the bottom of the screen will be marked "Safe Mode". In the mode, you need to type the command of interest and see if the smartphone has begun to work better.
To reset the mode, the phone must be rebooted.
SIM issues
A faulty SIM card can contribute to the appearance of an MMI code error. The card may be old, worn, or incorrectly cut. It will only help to replace it with a new one. The service is provided free of charge at any service center of the operator.
If the above methods do not help to fix the problem, it remains only to contact the telecom operator for help, perhaps the breakdown is not with you, but with the service organization.
If, when you try to make a call, send an SMS, or make a request for an account balance, a message is displayed on the phone screen about a connection problem and an invalid MMI, then simple manipulations should be done to restore communication. There is nothing complicated in them and even an inexperienced user can perform them.
The MMI (Man-Machine Interface) code is used to form USSD request from the keyboard of the mobile device. It starts with an asterisk and ends with a hash. When executing more complex queries within the code, an asterisk is used to separate the parameters.
We typically use these combinations when requesting balance information, expiration dates, topping up an account, etc.
Sometimes, when executing such a request, an error is displayed on the screen: “There is a connection problem or invalid code MMI.
Here are a few ways to fix this error:
1. SIM card problem
Like all electronic products, the SIM card is subject to physical wear and tear and may not work correctly. To correct a connection error, contact service center to replace the card. In this case, the phone number will remain the same. It is recommended to replace the SIM card every 2 years.
2. Insufficient or unstable 3G coverage
Mobile operators are constantly improving coverage and using third generation 3G, but it does not always work as it should.
Modern telephone sets also prone to modernization. For this reason, they use the GSM/WCDMA auto-connect feature by default. But with 3G outages, that network isn't always stable.
To eliminate the error with insufficient coverage, you need to set the GSM network as follows:
- go to 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 need to be permanently changed. After a while, try to turn on the old network mode again.
3. Operation of some applications
Some of the externally downloaded applications may be causing a connection error or an incorrect MMI code. To confirm or disprove this suspicion, boot your device in safe mode and try to make a request to the operator. If it goes well, then some application installed on the phone is to blame, which will need to be removed.
4. Problems with device settings
Incorrect device settings, as well as malfunctions in its operation, can cause a problem with the MMI connection.
Try restarting your device, and if the problem persists, try running 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, it remains only to wait. You can call the operator and find out how long the error with the MMI will be observed.
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