The telephone number on my iPad and iPhone are different. I want them the same. I don’t recognize the number on my iPad. How can I correct the number?
iPad Pro, iPadOS 15
If you don't recognize the trusted phone number on your iPad, first make sure that your account is Safe by following the instructions in this link If you think your Apple ID has been compromised – Apple Support (UK)
After that, you can follow these instructions to remove the telephone number
Update your trusted phone number on your Apple ID account page
If you want to add a phone number, click Add a Trusted Phone Number and enter the phone number. Choose to verify the number with a text message or automated phone call, and click Continue. To remove a trusted phone number, click 
next to the phone number you want to remove.
If you don't recognize the trusted phone number on your iPad, first make sure that your account is Safe by following the instructions in this link If you think your Apple ID has been compromised – Apple Support (UK)
After that, you can follow these instructions to remove the telephone number
Update your trusted phone number on your Apple ID account page
If you want to add a phone number, click Add a Trusted Phone Number and enter the phone number. Choose to verify the number with a text message or automated phone call, and click Continue. To remove a trusted phone number, click next to the phone number you want to remove.
Contact your carrier for assistance to see if they can give your a new SIM card for the iPad.
The telephone number on my iPad and iPhone are different. I want them the same. I don’t recognize the number on my iPad. How can I correct the number?
