iMessage not working
My iMessage has suddenly stopped working, it shows up as "Activation Unsuccessful".
I have also tried to log into it on my Mac but it won't let me, I can't get past the log in page but it doesn't flag up to say my details are incorrect.
i have tried restarting my phone several times throughout the day.
Any idea what the problem might be and how to fix it?
iPhone 6, iOS 12