iMessage makes it easy to connect with friends, family and colleagues.
This post fromMiniToolprovides some solutions.
Then, lets see how to get rid of the iMessage needs to be enabled warning pop-up.

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Hold and press the sleep/wake button for a few seconds until the slider appears.
Then, slide theSlide to power offoption.
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Finally, press and hold the sleep/wake button again until you see the Apple logo.
you better go toSettings > iMessage.
verify the toggle for iMessage is green and there is no message like iMessage waiting for activation below it.
Go to their system status page, if you see a green dot next to iMessage, its ok.
If its yellow or red, iMessage is off.
Step 3: Use the same method to find the Airplane Mode and turn it off.
In this situation, turning iMessage off and then on can solve the problem.
you might reset the internet tweaks by following the steps below.
Go to yourSettingsand open theGeneraloption.
Scroll down and tap theResetoption.
Then, tap theReset web connection Settingsoption.
Other Tips:
iMessage is an system of Apple.
If you want to use it on Windows 10/11, how to get it?
This post provides 3 ways for you to do that.