How To Fix Connection Problem or Invalid MMI Code On Android 2023?

How to Fix Invalid MMI Code or Connection Problem on Android: Invalid MMI code or connection problem is the number one problem faced by Android device users. If you are facing the same problem, don’t worry! This blog will help you to fix connection problem or invalid MMI code on your Android device. We will outline the different possible causes of the connection problem and provide tips to fix it. Let us help you get back to using your Android device the way it was meant to be used: with a stable connection and no errors!

MMI codes are not used regularly by mobile device users, but when they are used, their proper function is extremely important. Therefore, when an Android user sees a message saying “Connection problem or invalid MMI code”, he must be very frustrated. This bug prevents them from making certain calls and sending some text messages until they resolve this issue. Fortunately, there are several solutions for this problem and you can try them one by one if you encounter this problem on your Android phone.

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How to fix connection problem or invalid MMI code on Android

What are MMI codes?

Man-Machine-Interface or MMI codes are Android phone codes that contain characters such as hashtag (#) or asterisk.

in them. All MMI codes have some kind of similarity, but this does not mean that they are the same. These codes are divided into different categories based on the different actions they need to perform.

  • There are mainly four types of MMI codes:
  • SS Codes: Supplementary Service Codes are fixed codes on all mobile devices in the world and cannot be changed by your network operator. These codes are used to control features such as number presentation, call forwarding, etc.
  • USSD codes: Unstructured supplementary service data codes are those encoded as designated by the service provider. These codes are sent to the network provider to access information such as prepaid card balance, calling plan details, etc.
  • Manufacturer MMI codes: These codes are defined by the mobile manufacturer and are specific to your mobile model. These codes are used for operations like resetting the Android device, activating the service menu, etc. There is no need to press “submit” after entering these codes, as they are executed as soon as the last character or digit is entered.

SIM Control Codes – These codes are used to change SIM details such as your PIN code.

As you should see, there are various types of MMI codes and the invalid MMI code error must be caused by the proper functioning of any of these types of codes.

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How to fix connection problem or invalid MMI code on Android

From time to time, you should take advantage of the Connection problem or Invalid MMI Code pop-up error on your Android device. This usually happens when a user tries to send a human-machine interface code. What is an MMI code? It’s those funny codes you enter on your dial that include an asterisk

or hashtag (#) characters, like calling your Verizon Wireless phone to check your account balance, or sometimes it’s just a prefix code you enter before a mobile phone number. If the connection problem or invalid MMI code problem is driving you crazy, we have some solutions that should solve your problem. How to fix connection problem or invalid MMI code on Android.

easy reset

Just turn off your mobile phone (touch the Power button for a few seconds) and restart it again, see if that helps to fix the connection problem or invalid MMI code on your mobile phone. This method 1 should seem simple, but sometimes that is all it takes to get rid of the invalid MMI code error.

Reboot in safe mode

When using your mobile phone in safe mode, you’d better troubleshoot your phone as it will only play the standard Android program. By killing all other apps that are playing in the background, you should test to see if the invalid MMI code problem still occurs without other apps working by disabling apps. Safe mode will disable the pre-installed applications and services that came with the mobile.

  1. So to solve the connection problem or invalid MMI code problem.
  2. To reboot in safe mode or enter safe mode, follow the steps:
  3. Turn off your phone.
  4. Press and hold the power button to power on, continue to hold the power button until the logo appears.
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Press and hold the Volume Down button until the reset is complete.

You should see “Safe Mode” in the bottom left corner of your screen.

A combination with the Home button may be required for this process. Contact the manufacturer of your mobile to verify or consult the manual that comes with the mobile. Once in safe mode, try entering the MMI you used before to see if the issue persists. If you’re not having trouble sending the text at this point, then most likely a culprit app that might have a recent installation is causing the conflict. You should start by uninstalling the most recent app and continue from there.

check there: OPPO Reno 7 Pro 5G price, features and specificationsAdd a plus sign (+) or comma (,) to the code Trying to add a comma to the end of your code and dial again, a USSD code for example, if you try to dial *1234, try dialing


you must add a comma by holding down the asterisk

for about 3-5 seconds. Check if the error went away after adding a comma to the end of the prefix.

  1. Or try adding a plus sign (+) after the asterisk.
  2. log in with your code. This process forces the operation to look for the invalid MMI code error. For example, if you dialed *1234, try dialing *+1234. You should get the plus (+) sign by holding zero for about 3-5 seconds. The plus sign should clear the error message and allow the call to go through. This process forces the operation to look for the USSD code error.
  3. Check network settings
  4. You may get the error Connection problem or Invalid MMI code because you are not receiving reception. Try to set up your wireless service provider, go to:
  5. settings

Network connection

Mobile networks

Navigate to Network Operators

Search for networks and select your wireless service provider

  1. You must want to try this method 2 several times before giving it up. It may take a few attempts before connecting to the available network. If the network operator lookup does not find your operator or service provider, then you should check your SIM card for possible issues that should interfere with network or SIM authentication.
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Check SIM card

If you have a dual SIM phone, here are two options.

Deactivate one of your SIM cards and activate only the SIM you plan to use to send the MMI code. The mobile should not use the correct SIM card if you have both SIM cards working together.

In your phone’s dual SIM settings, find voice call settings by touching the menu. There it should give you the option to select which SIM card to use or “Always ask”, choose that option “Always ask”. When you try to dial the MMI code, the mobile will notify you and ask you which SIM you want to use, so you will have the option to select the correct SIM card.

If you have a traditional single SIM phone, try something simple like taking out your SIM card, blowing on it, cleaning it a bit, and plugging it back in. See if that resets the connection.

Activate SMS via IMS

This step is for the techies out there and we won’t go into details on how to do it as any wrong move using this method could potentially destroy your mobile phone or just cause more headaches to undo. It basically involves you using the Android secret code *#*#INFO#*#* or dial 4636 on the dial aka *#*#4636#*#* to enter Android test menu or info mode , this is where the professional technician goes. to get information about your mobile phone information or your device information. You need to ping test, activate radio and activate SMS via IMS here, which might solve your “Connection problem or invalid MMI code” problem. If you really want to try this method, feel free to google “how to activate SMS via IMS”.


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If you’re having connection issues on your Android device, the first step is to troubleshoot. This blog will walk you through the different steps you need to take to fix the connection problem or invalid MMI code. Be sure to keep the following tips in mind to get your device back up and running as quickly as possible. Thank you for reading.

Frequent questions

What are some common causes of an invalid MMI code on my Android phone?

If you are experiencing mobile network related issues with your Android phone, the most likely cause is an invalid MMI code. Your provider uses this code to identify the type of device you are using and the service you are subscribing to. To troubleshoot and fix the problem, try re-pairing your device with your carrier or using a different SIM card. If that doesn’t work, it may be due to poor signal strength, dropped calls, or blocked calls.

How can I fix a connection problem with my Android phone?

There are a few things you can try if you are having trouble connecting to the Internet on your Android phone. 1. Finally, open Developer Options and turn on USB Debugging. This will allow you to connect to the phone through the computer. 2. Reset network settings by going to Settings > Wireless & network > Cellular network and touch Reset. 3. If that doesn’t work, go to Settings > About phone and tap Build number seven times to enable Developer Options. Once Developer Options are enabled, you should be able to access the menu where you can check if the phone is in airplane mode.

What should I do if I’m having trouble connecting to the Internet or my Android phone?

If you’re having trouble connecting to the Internet or your Android phone, try the following: 1. Check if there’s a firewall or antivirus program that blocks access to certain websites or apps. 2. Make sure your phone is fully charged and there are no obstructions between the antennas and your phone. 3. Make sure you are using the most up-to-date version of your Android operating system. 4. If all else fails, disconnecting and reconnecting your device may resolve the issue.

How can I avoid running into this problem in the future?

There are a few things you can do to avoid connection problems in the future. Some of the steps you can take include: 1. Resetting your device’s network settings or factory reset may help fix the problem. 2. Always make sure that your Android phone is fully up to date and has the latest security patches installed. 3. If the connection problem persists, it’s time to visit an Android service center for repair or replacement.

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