Unknown Caller

If the caller's phone number is not saved in your contacts list, it will show up as UNKNOWN CALLER. Additionally, if the phone number is saved in your contacts list but the format is incorrect, it may also show up as UNKNOWN CALLER. For example, if the phone number is saved in your contacts list as "123-456-7890" but the caller is actually calling from a country that uses a different international prefix, such as +1, the phone number will show up as UNKNOWN CALLER.

To fix this, you can try the following:

• Check your contacts list to make sure that the caller's phone number is saved correctly.
• Update your contacts list with the correct international prefix for the caller's country.
• If you still see UNKNOWN CALLER, you can contact the caller and ask them to call you back from a different phone number.

Spaces, Hyphen or Parentheses in a Phone number depends on the International prefix

Watch the GIF below. Note here only numbers are being input, but Spaces, Hyphen or Parentheses are added by iPhone automatically

iPhone 6 iOS 12