Constant message saying: turn on imessage turn on icloud and turn on FaceTime

these are the kbs that refer to this situation

If you can’t turn on or sign in to iMessage or FaceTime on your iPhone - Apple Support

If you can't activate iMessage with your phone number in iOS 26 - Apple Support

JSberg wrote:

There is no guarantee that it will work, but try this.

First. Go to:

Settings > Apps > Messages > Send & Receive > uncheck your phone number. Leave your email address checked. Then disable iMessages.

Now. Go to:

Settings > Apps > FaceTime > uncheck your phone number. Leave your email address checked. Then disable FaceTime.

Then turn off your iPhone, wait a bit, and turn it back on. Make sure you are connected to WiFi, then go in and enable iMessage and FaceTime again, and if your number is not checked, do so.

That is interesting, the addition of unchecking the number before turning them off is a new one on me.

As they already tried turning imessage and facetime off, restarted, and turned them in again, I didn’t include that remedy here. Love to see if that works better, I’ll change my saved answer!

There is something wrong with your SIM provision, or you have some awful VPN or security app installed, both pf which are poison to iphones.

I'm also curious if it works. I imagine it's a registration error, and removing the phone number, deactivating, and reactivating may force iMessages to reregister the phone number, and stop asking to be activated. But we'll see - I hope the thread starter gets back to us with an answer.

There is no guarantee that it will work, but try this.

First. Go to:

Settings > Apps > Messages > Send & Receive > uncheck your phone number. Leave your email address checked. Then disable iMessages.

Now. Go to:

Settings > Apps > FaceTime > uncheck your phone number. Leave your email address checked. Then disable FaceTime.

Then turn off your iPhone, wait a bit, and turn it back on. Make sure you are connected to WiFi, then go in and enable iMessage and FaceTime again, and if your number is not checked, do so.