How to Fix Connection Problem or Invalid MMI Code?

If you cannot make any calls or send texts on your Android device, then it must be due to some connection or the invalid MMI code issues. MMI code issues happen for several reasons like weak carrier providers, SIM authentication, incorrect position of the characters, etc. So, here are some instructions to fix this error.

Reboot the System

  1. Press and hold the Power key on your device.
  2. Then you will see some options and select the Restart option to reboot the device.
  3. Now, check if the problem has been resolved.

Attempt Restarting to the Safe Mode

  1. You should long-press the power key on the phone.
  2. Thereafter, select the Restart option from the options.
  3. On the screen, you will view a prompt asking you whether you would like to restart to the safe mode and then choose the OK button.
  4. The device will be booted to the Safe Mode.

Activate the SMS and Radio over IMS

  1. You should invoke the dial pad then input ‘*#*#4636#*#*’ into it.
  2. Then you don’t regularly require to hold the send button as it will flash the service mode itself.
  3. Select the Service mode option and choose either ‘Phone information’ or ‘Device information.’
  4. You have to hold the button of ‘Run Ping test’ then choose the button of ‘Turn Radio Off.’
  5. Go to the option of ‘Turn on SMS over IMS.’
  6. Finally, restart the device.

Keep a Check on Networking Settings

  1. Navigate to the Settings option on your device.
  2. Thereafter, go to the Network Connection option and select it.
  3. You should choose the option of ‘Mobile networks’ and check for the ‘Network operators’ option.
  4. Now, looking for network operators then choose the ‘Wireless provider’ option.
  5. You have to redo this process.
  6. Now, reboot the device.

Check the SIM Card

  1. You should select the Settings option of the device.
  2. Then locate the ‘SIM cards and mobile networks’ option.
  3. After that, locate the dual SIM settings of the device then choose the ‘Voice call’ settings.
  4. You will see a prompt, asking you to select among ‘Ask every time’ or ‘Always Use SIM 1, SIM 2.’
  5. Now, choose the option of ‘Always Ask.’
  6. During inputting the MMI code, the device will ask you which SIM you would like to use.
  7. Choose the right one for correct results

I’m Bond walker . I’m a web developer living in New york. I am a fan of technology, a publisher of guides at Bussiness Directory  and programming. You can read my blog with a click on the button above.

Source:- How to Fix Connection Problem or Invalid MMI Code?

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