hello, I got suspicious sms from Apple at 12:36 (SMS starting with REG-RESP?v

Do you receiving the message when you are trying to activate iMessage and Facetime?

See this Apple  article  ☞  If you can’t turn on or sign in to iMessage or FaceTime

https://support.apple.com/en-us/HT201422

Perhaps Is your Wi-Fi network Is unavailable?

You are using an unsupported carrier, and you will be charged for the background text messages used to activate FaceTime and iMessage.

It is your choice to activate knowing you may be charged, or to cancel and not use these features.

Or you switch to a supported mobile carrier.

Hello slava1000uk,

Thanks for reaching out in Apple Support Communities today about the text message you received.

We're happy to help and let you know the article you reached out to us from is the right article you would use for phishing. Recognize and avoid phishing messages, phony support calls, and other scams

You will want to look at the section “How to report suspicious emails, messages, and calls” and follow the suggestion for messages: “To report spam or other suspicious messages that you receive through iMessage, tap Report Junk under the message. You can also block unwanted messages and calls.”

That was good looking out! Reach back out to us if you have further questions.

Take care!