Caller ID
Caller ID shows Unknown caller instead of the phone number on my iPhone13.
iPhone 13, iOS 15
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Firstly check that specific contact for errors.
You may have to change to the international format eg +44 7890123456 instead of 07890123456
If no help:-
Try this if your contacts are in iCloud or in your chosen email account
(You might want to back up the phone first, and if your contacts are phone only you have no remedy)
Close Messages app. then for
Contacts in iCloud:
Settings, Your name, iCloud, Turn off contacts
Contacts in another email account
Settings, Contacts, Accounts
Find the account with Contacts turned on. Turn contacts off
When asked if you want to keep them, choose “delete from my iphone ”
Open Contacts app and it should be empty.
Power the phone off and back on.
Then
Contacts in iCloud:
Settings, Your name, iCloud, Contacts. Turn it On
Contacts in another email account
Settings, Contacts, Accounts
Find the account with the Contacts again. Turn contacts On
Open Contacts app and it should be re-populated.
Then try the contacts or messages again.