When entering USSD codes, the so- called ‘Invalid MMI or connection problem’ error may appear . It can be a frustrating mistake if you want to know your balance or information related to your phone line. In any case, the error usually has a solution most of the time, as we will show you below.
Solution to: ‘Invalid MMI Code Error or Connection Problem’
Index( )
- What are MMI codes (USSD)
- How to fix connection problem or invalid MMI
- Modify the prefix code
- Try restarting the device
- Check that you have a signal
- line not active
- Operator faults or maintenance
- Boot the device to failsafe mode
What are MMI codes (USSD)
Also known as USSD, they are codes that make it possible to see information related to your telephone provider. In the vast majority of cases, these codes are used for the purpose of seeing the balance, mobile data and other valuable information for the user of an operator.
This type of code is used through the ‘phone’ application, that is, the one we use to make phone calls. In most cases, the MMI codes begin with symbols such as the asterisk ‘*’ or the numeral ‘#’ and, as we indicated, they are used to carry out basic query operations related to our telephone number.
How to fix connection problem or invalid MMI
Fortunately, the connection problem or invalid MMI is usually very easy to solve. In most cases it refers to typing errors, network connection failures or dropped service . Let’s thoroughly analyze the reasons for the problem and how to fix it.
Modify the prefix code
There is a possibility that you have simply written the MMI code wrong. Therefore, the first thing is to check that you are writing the code correctly, as indicated by the operator . It is important that you do not interchange symbols or numbers.
In fact, mistyping the code is one of the main causes for the ‘Invalid MMI Code’ error. In any case, if the above doesn’t work, there are a few more things you can try, but we insist, check that you have written the code correctly .
Try restarting the device
Rebooting the device may work when the connection or MMI problem arises. Turning the phone off and on will cause all essential applications to load again . It is possible that your sim card was not detected correctly, which could cause the MMI error. Similarly, try to insert the SIM card of your mobile . Again, you may have done it wrong.
Check that you have a signal
MMI codes require your phone to be connected to your carrier’s mobile network. If you notice that the cellular signal is very low or non-existent, this could be the reason for the connection error or invalid MMI .
In other words, verify that the mobile signal is adequate before entering any MMI code, if you do not have a connection, errors will appear. Therefore, if you live in an area with poor coverage, you will have to solve the mobile signal problems or move to a place where the signal is good to make your query.
line not active
Another reason that can cause connection errors or invalid MMI code is that you are no longer a user of the mobile operator. Therefore, if you have not used your cell phone for a long time, there is a possibility that your line has been cut . If so, you will have to contact the operator directly.
Operator faults or maintenance
Modifications or maintenance in the operator could be the reason for the errors with the MMI code. In most cases, the operators notify when maintenance is carried out . In any case, if it is a general failure, you can only wait. In most cases you can identify maintenance or signal problems when the 3G or 4G icons for mobile data do not appear or when the signal bar is very low.
Boot the device to failsafe mode
In devices with versions higher than Android 9 there is the so-called safe mode, very similar to the safe mode present in Windows. With this mode the cell phone will start with the basic functions , something that can help if you cannot access the functions of an MMI code.
