Home » [FIXED] Best Ways to Fix Phone Not Allowed for Voice (MM6 error)

[FIXED] Best Ways to Fix Phone Not Allowed for Voice (MM6 error)

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Ways to Fix Phone Not Allowed for Voice

The smartphone industry is growing massively, with new phones launched each day and advanced technologies flourishing. Not everyone can manage the latest flagship models. Therefore, they opt for refurbished or second-hand models. However, you might be troubled by the message “Phone Not Allowed MM#6 Error” when you insert a new SIM.

It occurs when you place a call or send a text message because the device is currently tethering to a different carrier. It occurs when the device is currently locked to a specific network. To avoid this, make sure the device you purchase is untethered, and no MM#2 or MM#6 errors are encountered.

Also read: Best Pedometer Apps for Android

This post will look at ways to rectify this error and restore the phone’s regular operation. 

How to resolve MM#6 errors?

There can be different solutions to fix the error and ensure that your phone is tethered to an appropriate carrier. However, it is always recommended to ensure a genuine and unlocked phone to avoid any troubles. 

Here are some methods to mitigate this issue:

1. Contact the carrier

You can contact the customer care of the mobile network and raise a request to unlock the device. However, the procedure can be cumbersome in specific scenarios:

  • If the device is blacklisted or stolen, you might need to fulfil some requirements before requesting unlocking. 
  • You might need to incur a certain Equipment Switch fee charged by the carrier in some cases. Also, the manufacturer provides a unique identification number for your phone. This number is helpful to track your device, and it is an illegal practice to change it. It is one of the most proven ways to rectify the MM#6 errors. 
  • Sometimes, the phone comes with an inbuilt mobile number. It is not possible to unlock such devices. 

2. Through Operation Menu  

Dialing *#78# can resolve the issue for few carriers. You can disconnect the carrier from the operation menu so that the device is in unlock state. Now, you can switch to a new SIM card.

Please note that this method does not apply to all carriers. Research your device carrier and brand before you opt for this solution.

3. Reinsert the SIM card

Try these steps to fix the phone not allowed issue:

  • Eject the SIM tray from your device.
  • Swap the SIM card and place the SIM tray back in the Android phone.
  • Insert the tray back and restart your device. 

4. Automate network selection

You can follow these steps for automating the network selection:

  • Go to the Settings ->Data usage option on your phone. 
  • Select “Mobile Network”.
  • An option to set SIM card preference will appear. Choose the automatic option.
  • Restart the phone, and check if you are still getting the MM#6 errors. 

5. Update the device

The issue might occur when the device software is not up to date. Follow these steps to update your Android phone:

  • Go to Settings and click on the option for a software update.
  • You can proceed further to update if it is available for your device.
  • Restart the device if the device doesn’t automatically restart after an update. 
  • Check if you are still facing the MM#6 errors.

6. Research your phone

If the above solutions don’t work, try searching for the specific carrier and device brand. You can unlock the phone by rooting the Android OS. If possible, take a backup of files and media stored on the phone to avoid wiping of all data. 

Frequently asked questions

1. Does the MM#6 issues occur for all phones?

No, the problem occurs only for locked devices or the devices tethering to a particular carrier. You won’t face the issue in unlocked devices. Therefore, it is always advisable to purchase a smartphone from a genuine dealer.

2. How to rectify the error on iPhone devices?

You can consult the carrier of your iPhone device or purchase SIM Unlocker to unlock the device. 

If you use SIM unlocker, here are the steps you can follow:

  • Insert the SIM with an unlocked chip. You will find the “Activation required” screen. 
  • Edit ICCID as provided with the product and complete the activation process.
  • Be cautious while inserting and removing the SIM. Excessive force can damage the product. 

3. How to check for the blacklisted phone?

Avoid inserting SIM cards for the phones that are blacklisted by carriers. You generally encounter the below error messages for a blacklisted device:

  • Invalid MMI
  • Phone not allowed MM#
  • Invalid MM#2
  • Phone not allowed MM#6 or Invalid MM#6


The above methods are not 100 % full-proof. If the issue persists, you can reach out to the nearest mobile repair centre. However, purchasing a phone from a trustworthy source is always recommended to avoid these hassles. 

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