How To Fix Connection Problem Or Invalid MMI Code On Android Device

Stuart Williams
By Stuart Williams 9 Min Read

Have you ever seen a message on your Android phone that says, “Connection problem or invalid MMI code”? If you have, you know it can be really annoying. This message usually means you can’t make calls or send texts until you fix the problem. There are lots of reasons why this might happen, but don’t worry, it’s not the end of the world!

Here’s the Good News: We’ve got several tricks you can try to get rid of that pesky “Connection problem or invalid MMI code” error. Just follow these steps one by one. If the first one doesn’t work, just try the next one!

What is an MMI Code?

Ever wondered what those codes starting with an asterisk (*) or pound (#) on your phone are all about? These are called MMI codes, short for Man-Machine Interface codes. Think of them like secret passwords that can unlock cool features on your phone.

For example, ever needed to find your phone’s unique ID, known as the IMEI? Just type *#06# and voila! Your phone’s IMEI number pops up. MMI codes like these let you access hidden functions and information on your phone.

Why Does the “Connection Problem or Invalid MMI Code” Error Pop Up?

Sometimes, though, these MMI codes can be a bit tricky, and you might see an error like “Connection problem or invalid MMI code.” This error can stop you from making calls or sending texts. It’s often caused by something going wrong with your phone’s connection to your network carrier or a hiccup with your SIM card’s authentication. This error is more common in phones that can use two SIM cards at once, but it can happen on other phones too.

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Ways to Fix the MMI Code Error

Got that annoying MMI code error on your Android phone? Don’t worry! We’ve got several easy-to-follow methods to fix it, starting from the simplest to the slightly more complex. Let’s dive in!

1. Restart the Android Device

Think a sneaky app is messing with your phone’s connection? Time to play detective by putting your phone in Safe Mode. This is like a secret world where only the essential parts of your phone work, so you can figure out if one of your apps is the troublemaker.

  • To enter Safe Mode, hold down the power button. Then, press and hold the Power icon on the screen.
  • Choose Safe Mode from the menu that appears.
  • Now, act like a detective and use your phone in Safe Mode. If the MMI error doesn’t show up, it means one of your downloaded apps is causing trouble.

2. Run Your Device in Safe Mode

If your phone works fine in Safe Mode, start removing apps you downloaded recently. Here’s how:

  • Go to Settings > Apps, and look for any app that seems suspicious or that you added just before the MMI error started.
  • Uninstall these apps one by one.
  • After each uninstall, restart your phone normally (not in Safe Mode) and check if the MMI error is gone.
  • Keep doing this until you find the app that was causing the issue.

3. Use Airplane Mode

Believe it or not, the simple act of switching to Airplane Mode can sometimes fix the MMI code error. Here’s how to do it:

  • Step 1: Swipe down from the top of your screen to open the quick settings panel.
  • Step 2: Tap on the airplane icon to turn Airplane Mode on. This makes your phone stop trying to connect to any network, which is kind of like giving it a little break.
  • Step 3: Wait for about 10 to 30 seconds. This waiting period lets your phone’s network systems reset.
  • Step 4: Tap the airplane icon again to turn Airplane Mode off. This gets your phone back to searching for network signals.
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Turning on Airplane Mode and then off again helps refresh your phone’s network connection. Sometimes, a simple refresh is all it takes to clear up the MMI code error.

4. Reset Your Network Settings

If the MMI error is still bugging you, it’s time to reset your network settings. This can solve problems if your network settings haven’t updated correctly or if there’s some glitch messing things up.

  • Step 1: Go to the Settings app on your Android device.
  • Step 2: Tap on General Management. Alternatively, you can use the search icon at the top and type “Reset” to go directly to the next step.
  • Step 3: Scroll down and select Reset.
  • Step 4: Choose Reset Network Settings.
  • Step 5: Confirm your choice by tapping Reset settings. Your phone will take a moment to reset and then restart.

Once your phone restarts, it’s like giving it a clean slate for its network connections. This often solves the MMI code error.

5. Modify the Prefix Code

Sometimes, just a tiny tweak to the MMI code you’re entering can make a big difference. Here’s a little trick: adding a comma or a plus symbol to the end of the code. This small addition can sometimes bypass the error and get things running smoothly.

  • Comma Method: Let’s say the code you’re entering is 29047#. Just add a comma at the end, so it looks like this: 29047#,.
  • Plus Symbol Method: Alternatively, you can add a plus symbol after the asterisk. If your code is 29047#, change it to +29047#.
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These tiny changes tell your phone, “Hey, let’s ignore any errors and just run this code!”

6. Activating Radio and Turning on IMS over SMS

This method is a bit more technical but can be very effective. It involves going into your phone’s service mode to tweak some settings.

  • Step 1: Open the Dial pad on your phone.
  • Step 2: Type in ##4636##. Don’t worry about hitting the send button; this code automatically takes you to Service mode.
  • Step 3: In Service mode, select Device information or Phone information.
  • Step 4: Run a Ping test.
  • Step 5: After the test, click on the Turn Radio Off button. This action will restart your Galaxy.
  • Step 6: Once your phone is back on, select reboot.

This process helps reset your phone’s internal communication functions, which can clear up the MMI code error.

Wrapping It Up: Solving the MMI Code Puzzle

So, there you have it! We’ve explored a bunch of different ways to fix that pesky MMI error on your Android phone. Some methods are super easy, while others might need a bit more tech-savvy. Remember, MMI errors are more common in phones with two SIM cards, but they can pop up in single SIM phones too, often due to weak signal strength or network issues.

What If It’s Still Not Working? Don’t lose hope! If none of these tricks work for you, your next best friend is your service provider. Give them a call or drop them a message. They’re like the detectives for phone issues and can help track down what’s causing the MMI error on your phone.

Always remember, technology can be tricky, but there’s almost always a solution out there. Happy troubleshooting!

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Hey, I'm Stuart, a tech enthusiast and writing expert. With a passion for technology, I specialize in crafting in-depth articles, reviews, and affiliate content. In the ever-evolving world of digital marketing, I've witnessed how the age of the internet has transformed technology journalism. Even in the era of social media and video marketing, reading articles remains crucial for gaining valuable insights and staying informed. Join me as we explore the exciting realm of tech together!
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