Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
By selecting “All Contacts,” your iPhone will only allow calls from the contacts saved in your phonebook.
Source: https://www.devicemag.com/iphone-block-all-numbers-not-in-contacts/