How to Fix Connection Problem or Invalid MMI Code On Android


How to Fix Connection Problem or Invalid MMI Code On Android: MMI codes have not utilized consistently by a telephone client. However, when they have utilized their appropriate working has critical. Subsequently, when an Android client sees a message saying “Association issue or invalid MMI code” it tends to profoundly disappoint. This mistake prevents them from settling on specific decisions and sending some instant messages until they settle this issue. In this aide, we will clarify how to fix association issues or invalid MMI codes on Android devices. Luckily, there are various answers for this issue and you should attempt them individually assuming you are experiencing this issue on your Android device.

What are MMI Codes?

What are MMI Codes

Man-Machine-Interface or MMI codes are phone codes that contain characters like hash (#) or reference bullet (*) in them. All the MMI codes have some sort of comparability, yet this doesn’t imply that they are something similar. These codes fall into various classifications in light of the various activities they can perform. A portion of these codes are sent through an SMS, some are utilized to accumulate data from the device and some are sent over to the network.

Primarily there are four sorts of MMI codes:

SS Codes: The Supplementary Service Codes have hard-coded into each device all over the planet and your network administrator can’t transform them. These codes are utilized to control highlights like number show, call sending, and so forth.

USSD Codes: The Unstructured Supplementary Service Data Codes have the codes assigned by the network supplier. These codes have shipped off the network supplier to access data like pre-loaded card balance. Call plan subtleties, and so forth.

Manufacturer MMI Codes: These codes have characterized by the phone manufacturer and have intended for your telephone model. These codes have utilized for activities like resetting the telephone device, initiating administration menus, and so on. You don’t need to press ‘send’ subsequent to entering these codes as they have executed when the last person or digit has placed.

SIM Control Codes: These codes have utilized to change the SIM subtleties, for example, its PIN code.
As you can see there have a few sorts of MMI codes and the invalid MMI code mistake can cause because of the ill-advised working of any of these code types.

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

There can be many purposes for the “Association issue or invalid MMI code” blunder. Nonetheless, most times this issue is caused when there are issues with either the network supplier or with the SIM confirmation on your Android device. Consequently, the arrangements given underneath manage these causes. You can attempt these arrangements on various occasions as here and there they work the second or third time.

1. Modify the Prefix Code

This is the simplest arrangement assuming that it works for you. Subsequently, you ought to attempt this arrangement prior to moving to more convoluted ones. In this arrangement, you ought to have a go at adding a few characters to the prefix code and check on the off chance that these progressions work.

  1. The comma (,): For instance, the MMI code you are attempting is *1234. Then, rather than that take a stab at dialing the code with a comma (,) eventually, as *1234. The comma (,) sign on your portable can add by holding the reference bullet (*) button for right around 3 to 5 seconds. A comma ought to continuously be added to the furthest limit of the code.
  2. Additionally (+): You can likewise have a go at adding an or more (+) signs after the indicator (*) sign in your MMI code. By adding the, in addition, to sign you force the activity to look for the invalid MMI code mistake, which might bring about bypassing the error message and finishing the entire process. Subsequently, on the off chance that you were dialing *1234, presently you ought to dial *+1234. You can add the in addition to the (+) sign by holding the no key for almost 3 to 5 seconds.

2. Change SIM Activation and Restart Phone

Change SIM Activation and Restart Phone

If the ‘Association issue or invalid MMI code’ error is caused because of some correspondence issue with the network supplier, then, at that point, you can take care of this issue by changing the SIM actuation settings. Follow the means given below to satisfy this undertaking.

  1. Go to the ‘Settings’ on your Android device.
  2. Of course ‘Portable Data’ will be enacted. Deactivate it.
  3. Subsequent to deactivating the portable information, tap on the ‘SIM management choice on the settings screen.
  4. Tap on the ‘Actuate’ choice below your telephone SIM to begin the deactivation process.
  5. Tap on ‘alright’ to deactivate your picked SIM.
  6. Trust that the deactivation will finish.
  7. Tap on ‘alright’ when the ‘Successfully deactivated’ message shows up on your screen.
  8. You can see that your SIM has deactivated. Presently, you should reactivate your SIM. For that tap on the ‘Actuate’ choice on the screen.
  9. After your device has rebooted attempt to dial the MMI code and it ought to work. On the off chance that the above-given arrangement doesn’t work for you, then, at that point, you ought to continue with the following arrangement.

3. Operate under safe mode temporarily

Operate under safe mode temporarily

Going into experimental mode might assist you with the “Association Problem Or Invalid MMI Code” mistake. The experimental model is an activity where your cell phone stacks no outsider applications. This permits you to segregate the issue to check whether any outsider applications are causing this issue.

To go into experimental mode, hold the power button off for a couple of moments until a message shows up. Feel free to affirm that you might want to restart your phone into experimental mode. Yet again when you are in the Safe Mode, attempt to enter your ideal MMI code to check whether you are as yet getting the association issue or an invalid MMI code mistake. In the event that it works, you know it’s one of the outsider applications you have.

4. Check Network Settings

How to Fix Connection Problem or Invalid MMI Code On Android

You ought to check the network settings of your device and it might settle this MMI code mistake. This arrangement will work assuming your versatile can’t get the appropriate signatures from the specialist co-op.

  1. Go to the ‘Settings’ screen of your Android device.
  2. Tap on the ‘Portable networks’ to continue.
  3. Here you can tap on the ‘Favored network type’ to see the sorts of network-accessible and pick your network type, we have picked the ‘3G’ network type.
  4. Tap on ‘Network administrators’ to see the rundown of administrators accessible.
  5. Sit tight for the network administrator search to finish.
  6. Pick the network which you need to utilize.
  7. Close all the applications and attempt to redial the MMI code. This arrangement ought to take care of your concern.

5. How to know genuine USSD codes

Many USSD codes don’t give substantial client administrations. The users can look for the code that is fitting for the assistance they are searching for. The codes can be accessed via looking for the real code from the portable administrator or searching it up on the web search tool they are utilizing in their program.

6. When to troubleshoot MMI error

How to Fix Connection Problem or Invalid MMI Code On Android

Many issues can make the device run into an association mistake. At the point when the client has exited the accessible strategies to address USSD associations, they can investigate. The clients can contact their versatile administrators for the issues to be figured out.


Association issues or invalid MMI codes can make many bothers many clients. At the point when the mistakes happen it implies that the client won’t access the administrations they need. The issue can be addressed utilizing many techniques. The user needs to guarantee that the code they are utilizing is suitable. The code mixes shift in the nation of utilization. Association issues have primarily brought about by the network supplier administrations by the administrator. The client can utilize the strategies given above to address the issue about the association issue.

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