Kaspersky Who Calls for iOS

It takes the app a lot of time to update information about phone numbers

The reason for this issue is that it takes time for the operating system to process new data when the databases have been updated or when you add a new number to the spam list.

Solution: depending on the device model and some background processes, the data update may take from 1 to 10 minutes. Only after that will the operating system be able to use the new information and, for instance, block calls from a new spammer.