How to Fix Waiting for Activation iMessage
What are the reasons to iMessage not activate on your iPhone or iPad?So what you will when your iOS device stuck on iphone waiting for activation? There are a few reasons for showing this message on your screen. But we cannot say the exact one reason for that. Before proceeding with this tutorial, you must know that. 

iMessage takes up to 24 hours to activate on your iOS device.
You need to connect WiFi or mobile internet to activate iMessage.
When activating, Message service must work without any issues. 

Still, you cannot activate iMessage. Let see how to fix this issue on your iPhone.These are the possible methods you can try. 

Check your Internet connection
iMessage does not activate without an internet connection. Once the WiFi network connection, make sure to check whether the internet is working. You can open a web page and confirm it.

Turn Airplane mode Off and Turn back it On
After you connected to a WiFi connection, By turn off and turned on Airplane mode, it could fix technical glitch inhibiting in your iPhone ability to connect wireless networks.

Check the date and time is correct
Another common reason to get waiting for activation iMessage is incorrect date and time with timezone. So, go to setting app then general and tap on date and time. Make sure the green button is next to "Set Automatically." 

Restart your iPhone
If you are getting an iMessage error on your iPhone, now you can try to restart your iOS device. After the restart, most of the errors will be fixes. Make sure to restart your iPhone properly.

Turn off and Turn on iMessage
Sometimes, restart iMessage service is the best solution for this issue. Hence, you can do it from message settings. Go to Setting App then Messages, and Now you can see the toggle button to turn off iMessage. Do it and wait for a few seconds and turn back it on iMessages. Then you can try to activate iMessages.

Update to latest iOS version
When the bug is getting on a specific iOS version, Apple releases new updates for fixing bugs. Sometime if you recently updated iOS version and go error on iMessage, This can be the bug, So try to search a new update is available to update. Go to Setting App and General, Then tap on software update and see is there any update available, If yes, update it and see the result. 
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iMessage Activation