How to Solve Connection Problems or Invalid MMI Code

Below are ways to overcome connection problems or invalid MMI codes, namely by:

Good Cellular Network

Of course, make sure first if you want to check your credit or quota by ensuring that your SIM card network is good or is in a public area. 

Active Cellular Network

Second, make sure you have an active SIM card. Because if your cellular network is not active, you may not be able to access the MMI code.

Check MMI Code

Thirdly, it is very important to check that the MMI code you entered is correct. Don't enter the wrong code or type the wrong numbers or symbols.

Now, if there are numbers or symbols that are in the wrong or incorrect position, it will display "connection problem or invalid MMI code".

Restart HP

Next, if the MMI code is invalid, you must restart the smartphone to refresh the smartphone system that is experiencing problems, causing the MMI code to be invalid. 

To restart it, you can press the power button on the side of the smartphone for a few seconds and let it turn back on. 

Or you can also look for the restart feature on your smartphone, click on the feature and wait for it to turn off and on by itself. 

Airplane Mode

Fifth, you can turn airplane mode on and off on your smartphone. If airplane mode is active, it will turn off all networks, both WiFi and Cellular Data. 

If it is disabled again, it will turn on all the networks you used earlier on your smartphone, both WiFi and Cellular Data. How to: 

1. Open your Smartphone;
2. Scroll down 'Quick Panel / Scroll Down Menu';
3. Find and Click the 'Flight Mode' Feature;
4. Finished;
5. If you want to turn it back on, just click on the feature.

By using this method, you may be able to access the MMI code again because the entire network has been refreshed.

Enable and Disable SIM Card

Sixth, you can deactivate and activate the SIM card through the SIM Manager feature in settings. This method can also refresh your cellular network. How to:

1. Open Smartphone;
2. Look for the 'Settings' Menu;
3. Search Connections;
4. Select the 'SIM Manager' menu;
5. Select the SIM to be deactivated;
6. Done.
7. If you want to activate it again, you can click back. 

Change Network Type 

In addition, you can also solve network problems or invalid MMI codes by changing the type of cellular network on your smartphone, from 4G to 2G. 

This method is also commonly used when you want to top up your internet package and also to stabilize the network and refresh the network. 

1. Open Smartphone;
2. Open 'Settings';
3. Look for the 'Connection' Menu;
4. Look for the 'Mobile Networks' Menu;
5. Click or Swipe Toggle on the selected SIM;
6. Done.

Network Reset

It may be one of the common ways for iOS users to reset the SIM network used. However, it is not uncommon for Android users to do so. 

iOS

1. Open iPhone;
2. Select the 'General' menu; 
3. Click the 'Transfer or Reset iPhone' option;
4. Click on the 'Reset' option;
5. Click 'Reset Network Setting';
6. Done.

After that, all networks on your iPhone will be reset back to factory settings. This way, you can access the MMI code again. 

Androids

1. Open your Smartphone.
2. Open the 'Settings' Menu.
3. Select 'General management'.
4. Select 'Reset'
5. Click 'Reset Network Settings' 
6. KTap 'Reset Settings'.
7. Click 'Reset' 
8. Done.

Update Software/OS

Next, to solve the problem of invalid network or MMI code, you can update your smartphone's software or operating system. It is possible that your smartphone's software or operating system is still old or needs repair so that it can access the MMI code again.

Therefore, it is very important that if your smartphone gets a 'software update' notification, you should update it immediately.

Here's how to update the software on your smartphone, namely: 

1. Open your Smartphone;
2. Open the 'Settings' Menu; 
3. Look for the 'Software Update' Menu;
4. Click 'Download and Install';
5. Wait a moment;
6. Once finished, check the MMI code again. 

Disable Third Party Apps

It is possible that if you are activating a third party application, this can also be one of the causes of network problems or invalid MMI codes. 

It is also recommended to never use third-party applications because it will cause various problems on your smartphone. 

Here's how to disable third-party applications, namely by: 

1. Press and hold the 'Power' button;
2. Select the 'Reboot to Safe Mode' option;
3. Wait a moment;
4. Finished;
5. Or you can also uninstall the application directly. 

Insert Comma at the End of Prefix Code

One of the rare ways that users do this is by adding a comma at the end of the code, for example *2904*7, 

By entering this comma, it is only used to perform operations, ignore errors or stop other actions. 

In addition, you can try using the plus sign ('+') after the asterisk (*), for example *+2904*7#

Turn on Radio

You can also enter information about your smartphone and activate the radio to activate IMS via SMS. Here's how:

1. Press *#*#4636#*#*\
2. Follow the Information. 
3. Select 'Run Ping Test'. 
4. After that, select the turn off radio option. 
5. Press 'Enable SMS via IMS'. 
6. Finally, reboot your smartphone.

Clear Cache and Data

Next step, you can also delete cellular data and cache that causes network problems or invalid MMI codes. Here is the information: 

1. Open your smartphone. 
2. Open the 'Settings' Menu. 
3. Select 'Applications'. 
4. Select 'Contacts' 
5. Press 'Cellular Data'. 
6. Click on the 'Clear Data' or 'Clear Cache' option. 
7. Done.

Contact Mobile Operator

If you continue to be unable to access the MMI code, you should immediately contact Customer Service to ensure there is no disruption. 

In this way, they can also help you via telephone or social media to access the MMI code again. 

Check on Down Detector

Next, you can check whether there is any interference with your cellular operator, you can try this by visiting a site. Down Detector. 

The site will display a number of reports over the last 24 hours, such as network disruptions. 

However, if your cellular network is experiencing problems, you can wait patiently or contact your provider's Customer Service directly. 

Below is a way to see whether your cellular network is experiencing problems or not by doing the following:

1. Open Google Chrome (Android) or Safari (iOS) Browser.
2. Search for Down Detector or click https://downdetector.id/.
3. You can scroll down to select the provider used. 
4. Click on the selected Provider. 
5. Done and you can now see your network problem report. 

List of MMI Codes for All Operators

Telkomsel

1. *808#: Purchase internet data packages, check balances, or make bill payments.
2. 500*55*: Subscription content service.
3. *999#: Purchase of call packages.
4. *505#: Activate the emergency package.
5. 500*77#: Sweetchat subscription registration.

Indosat

1. *123*50#: Indosat card information
2. 556(14 digit code from Indosat# voucher): Activate Indosat quota voucher.
3. *123*22*1#: Check remaining Indosat package quota.
4. *123*60#: Indosat's cheap daily internet package.

XL

1. *080# or *123# : Check XL quota.
2. *500*8#: To ensure that you are not currently subscribing to any content services.
3. *911#: XL emergency package activation.
4. *123*16 voucher code#: Activate XL quota voucher. 

Device MMI Code 

Each device certainly has a different MMI code to access features or services on the smartphone. Here's how to do it: 

MMI Code on iPhone

1. *#06#: Check IMEI.
2. *#33#: Controls calls and restrictions in outgoing call mode.
3. *5005*25371#: check the warning system is working properly.
4. ##002#: Manage services such as voice calls, data calls, and SMS call forwarding.

List of MMI Codes on Android

1. *#06#: Check IMEI.
2. “*#1234#”: Check the originality of Samsung cellphones.
3. *# 0 *#: Tests the performance of the display, screen response, camera, and speaker.
4. ##4636##: Check phone 1 and 2 and WiFi information on Android device.