What To Do If Imessage Activation Fails On Iphone?

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When the iPhone user is trying to back up his iPhone device on an iTunes system, you fail due to an interruption through the security apps such as firewall and antivirus. Also, there are some additional reasons for the issue, such as a corrupt iTunes installation or operating system. So, if you would like to solve this issue, here are some instructions to fix this problem.

Reboot the iPhone and Insert the SIM Card Again to Resolve the iMessage Activation Failed Issue
If you are attempting to reboot the iPhone and insert the SIM card again for repairing the iMessage activation failed issue on iPhone, carry on with the step-by-step instructions discussed below:

Firstly, you have to turn off the iPhone and detach the SIM.
After that, wait for some time and insert the SIM card again.
Now, turn on your iPhone, then look at whether iMessage is operating well.
Modify the Connection Mode of the iPhone to Resolve the iMessage Activation Failed Issue
If you are attempting to modify the connection mode of the iPhone for repairing the iMessage activation failed issue on iPhone, carry on ...
... with the step-by-step instructions discussed below:

You should turn off the cellular data of the mobile then link to a Wi-Fi network.
If you are already connected with the Wi-Fi, turn it off and turn on the cellular data.
Now, look at whether you should activate iMessage.
Add the Mobile Number in the iPhone Settings to Resolve the iMessage Activation Failed Issue.
If you are attempting to add the mobile number in the iPhone settings for repairing the iMessage activation failed issue on iPhone, carry on with the step-by-step instructions discussed below:

You have to open Settings on the iPhone.
After that, tap on the Phone option.
Then select the ‘My Number’ option and remove the previous contact number.
You should add the new number then store it.
Later, reboot the mobile and look at whether iMessage is operating well.
Otherwise, attempt adding the number into the setting of iPhone without country code, then look at whether the issue is fixed.
Reset the Network Settings to Defaults to Resolve the iMessage Activation Failed Issue
If you are attempting to reset the network settings to defaults for repairing the iMessage activation failed issue on iPhone, carry on with the step-by-step instructions discussed below:

Invoke the iPhone’s settings and select the Messages option.
Then turn off the iMessage.
You have to relaunch the iPhone’s settings and choose the ‘iTunes & App Store.’
Later, select the Apple ID, then choose the Sign Out button.
You should choose the Settings option of the iPhone.
Then select the General button.
Go to the Reset button and choose the ‘Reset Network Settings option.
Later, reboot the iPhone.
Now, login to the iTunes & App Store.
Finally, turn on the iMessage, then check whether the activation problem is fixed.
Deregister the number from iMessage to Resolve the iMessage Activation Failed Issue
If you are attempting to deregister the number from iMessage for repairing the iMessage activation failed issue on iPhone, carry on with the step-by-step instructions discussed below:

You should open a browser then launch the deregister message.
Then move down then input the number in the contact number section.
Later, choose the Send Code option.
You have to insert the verification code into the website then select the Submit option.
Then wait for the verification message.
Finally, reboot the iPhone and check whether iMessage is removing the issue.
Sign Out of Each Apple Device to Resolve the iMessage Activation Failed Issue
If you are attempting to sign out of each Apple device for repairing the iMessage activation failed issue on iPhone, carry on with the step-by-step instructions discussed below:

You have to sign out of each Apple device.
If the device is not applicable, then launch Settings of the iPhone and select the username option.
You should move down then select the ‘name of a device’ option.
Later, choose the ‘Remove from Account’ option, then verify to unpair the device.
Now, remove each device.
Finally, activate the iMessage and check the issue.
Source:https://canon2start.com/what-to-do-if-imessage-activation-fails-on-iphone/