iMessage is not working

Taking the juicy bits from Ingo's link...

do all 6 steps here, don't miss any out

1.   Settings, Apps, Messages, turn off iMessage  

2.   Settings, Apps, Facetime, Turn off Facetime,  

3.   Power down the phone

4.   Turn on the phone again  

5.   Settings, Apps, Messages, turn on iMessage,  

6.   Settings, Apps, Facetime, turn on Facetime

Then ensure your correct number appears in the Send & Receive 

To activate iMessage and FaceTime using your Phone number

1. First, check to know whether you have an SMS plan enabled for at least one SMS*** with your carrier. Contact your Carrier (Cellular Service Provider), the agency that issued the SIM to you
2. If your iPhone is used with a carrier not found in the wireless carrier articles, make sure you can send and receive international SMS. (One international SMS*** Only)
3. If you can't turn on or sign in to iMessage or FaceTime - Apple ...

*** You may not have an SMS plan (Domestic & International) enabled by your carrier for the SIM/eSIM that you use on your device. Apple Inc. does not provide SMS services.

Do you get an error message? Any VPN enabled?

Does it work, if you use the email address instead of the phone number?

Did you already have a look at the general troubleshooting tips in this related article?

If you can't send or receive messages on your iPhone or iPad - Apple Support

I've been having the same problem since yesterday, iMessage and FaceTime are just waiting for activation in relation to the phone number and they only activate the mail, since then I've done everything to try to solve the problem and nothing, I'm on an iPhone 11. iOS 27