My iphone is automatically sending sms

Those numbers are the activation servers in the UK for iMessage and FaceTime. If your carrier is an approved Apple carrier, then they will be charging you for each of those, Apple approved carriers do not charge. If you do not wish for this charge, then you have to turn off iMessage and FaceTime. See this:

Stop iMessage & FaceTime SMS to servers in UK

from fellow ASC User: Lawrence Finch

So, for FaceTime in Settings/FaceTime first turn it on if it is off, then tap on the Apple ID and sign out.

For iMessage, Settings/Messages, turn it on if it is off, then tap on Send & Receive, the Apple ID, and sign out.

You have to actually log out of FaceTime and iMessage; just turning them off doesn’t work (it actually makes the problem worse, as the phone continues to say “hi, I’m off the air for now."

towhidurandall Said:

"My iphone is automatically sending sms: My iphone 7 is automatically sending sms to that following number. please help me to stop it. It is charging BDT 3.33 as international text sms cost for each sms. I don’t know this number and please help me to stop this issue."

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Stoping Text Message Forwarding:

Go Here: How to Forward SMS/MMS Text Messages from your iPhone to your iPad, iPod touch or Mac - Apple Support

You need to choose which devices can send and receive text messages from your iPhone.

1. Go to: Settings
2. Tap: Messages
3. Tap: Text Message Forwarding
4. Tap: a listed device so that it is greyed-out.

I did not experience this yet but I found a similar thread on this community: https://discussions.apple.com/thread/8117300.

The answer was Apple Recommended. I hope it may help.

You're welcome.