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Apple iPhone Xs: Call Filter

Do Not Disturb (DND)

This is what Apple calls its call filter.

Allow Calls/finely adjustable Positive List

Apple calls it «Do Not Disturb» – check the setup menu DND / Allow calls:

Favorites = Anonymous callers and disturbers get busy or mailbox

Callers with suppressed call number immediately get a busy signal or be thrown to the mailbox when activated DND. cheeky

Set a Time Window for conservative People and Hardliners, which you still like

Families and friends who suppress their call number (call without a caller ID) can only call at certain times. For example, between 18:00 and 20:00 everyone would go through, even if the caller can not be found in the address book of your iPhone because of CLIR (abbreviation for Calling Line Identification Restriction).

The outgoing message to your mailbox you could formulate accordingly:

«landed on the mailbox only because of CLIR,
… please next time call with activated caller ID!».

Alternatively, enable a rough positive list

If anonymous callers, stalker, automatic dialing and dialing the wrong number fax machines are to be blocked, but everyone else should call contact saved in the iPhone address book, you can find the ideal solution later in the settings menu:

DND / Allow calls from:


This option allows the selection of contacts / groups

As soon as diallers of dubious advertising callers ring at short intervals without interruption and suppress your own telephone number or display a fake, constantly changing telephone number, DND must remain active, otherwise you are no longer reachable for serious callers!

Only with iOS 13 did Apple deliver an effective Call Filter

Apple customers had to wait until 19 September 2019 for a proper call filter. Only with iOS version 13 did Apple deliver this function, which is a matter of course for smartphones. The first iPhone generation with an effective call filter was the 11 series: iPhone 11, iPhone 11 Pro and iPhone 11 Pro Max were delivered with iOS 13.

Mute unknown Callers

Calls from unknown numbers are muted, diverted to the answering machine (also called mailbox/voicemail) and displayed in the call list.
If you have deactivated the answering machine, these callers immediately receive a busy signal.

For incoming calls from your contacts, people who have called you recently and Siri suggestions, the iPhone will continue to ring.
That's a great solution, because I'm sure many customers call new contacts before they have time to save them in the address book.

Apple has also extended the sorting out of unknown contacts to iMessage and SMS …

Filter unknown Senders

iMessages and SMS that do not come from your own contacts are sorted into a separate list.

If you have to be available to everyone and only want to block unwelcome spammers, you better buy an app to handle it. But be careful! There are many rip-offs!

As a private citizen, I don't have to answer every call because it might be a customer. Out of curiosity and as a technical gimmick, I had been looking for a working call filter app for my iPhones for a while and finally found a serious real working app from a hardworking nice developer in «Call Ranger».
My solution for private individuals: Answering machine («mailbox») is deactivated. Anyone who is not in my address book is an «unknown caller» and they are muted and get a busy signal directly. They are then listed in the call list in red letters under «Missed». I only call back if the subsequent reverse search shows that it is a serious contact. My acquaintances and friends inform me about changed phone numbers by e-mail, SMS or Threema. Otherwise, there will be no quick callback. Safety first!

Next page: Assistant Siri …

Keyword list: Apple iPhone Xs, Assistant Siri, Call Filter, Call Ranger, E-Mail, Groups, IT, Mailbox, SMS, Smartphones, Threema, Who, iPhone

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