5 simple ways to fix “Connection Problem” or An “Invalid MMI code” error USSD Codes

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If you’re an Android smartphone user, a lot of times, you’ve encountered an error message such as ‘Connection Problem’ or MMI code not valid in the process of securing a USSD code.It’s a major issue that impacts the phones and results in the imposing of some limitations when sending texts and receiving calls, checking balance as well as recharging mobile phone numbers and more.

What are the reasons for the “Connection problem” or ‘Invalid MMI Code’ issue.

While the problem is typically observed in two SIM smartphones, the error could also occur on only one SIM phone. The reason for this is usually due to problems with the carrier or as a result of SIM authentication issues.To resolve this issue, here are five simple but effective ways to solve the ‘Connection Problem ‘ or ‘Invalid MMI Code’ issue.

Method 1. Select the Safe Mode mode. It temporarily blocks the pre-installed apps and services included on the device. It assists in identifying the app responsible for the problem that could be interfering with the functioning of the network on the phone. For entering Safe Mode, turn off the phone, and then hold the power button. While pressing the power key, you will be tapping your menu button until you can see the Safe Mode option on the left-hand side of the display.

Method 2. Modify the prefix Code Another method to resolve your connection issue is very easy. Simply add the comma (,) at the end of the prefix code (*135#). This will force the operation to search for errors. You can also add plus (plus) after your prefix code. It functions similarly to the one-way comma.

Method 3. Engage Radio to turn off IMS over SMS This is another method to fix connection issues. This method is to enter the information mode, and then turn on the radio to enable IMS via SMS. The steps below must be completed to dial *#*#4636 #*#* to dial the dialer, navigate to Phone Information, then click on the ‘Run Ping Test’ button. Once the test has been completed, click on “Turn Off Radio” then press “Turn to IMS over SMS”. Then, reboot the phone. This will resolve your problem.

Method 4. Restart your phone several times, switch on your phone and go to the network settings. Hold the power button and home buttons in a row until your phone switches off. After that, turn it back on.

Method 5. Select Network Operator Manually Navigate to Settings>Network Connection>Mobile Networks>Network Operators. There will be a list of available networks in the list. Then, select your service provider, and repeat the process 4 times until the service begins functioning again

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