Screen Unknown Senders on iOS 26: what it does, and how to stop missing real texts

1. What Screen Unknown Senders does

With the switch on, a text from an unknown sender (a number or email address that isn't in your Contacts and that you have never written to) doesn't appear in your conversation list. Instead:

• it goes to the Unknown Senders list, reachable from the Filters button in Messages;
• you get no notification, unless the text falls into a category you have allowed (next section);
• its links are disabled and images blurred until you mark the sender as known or add them to Contacts.

In Apple's words, you can "prevent unknown senders from texting you directly". Note what the feature is not: it doesn't read the text or judge whether it is spam. A scam from a new number and a one-time code from a new service get the same treatment, because both come from unknown senders.

2. Where the setting is

1. Open Settings → Apps → Messages and scroll down to the section headed Unknown Senders. There is no separate sub-menu; everything sits on the Messages page. On iOS 27 there is also a shortcut inside Messages: tap the Filters button in the conversation list, then Manage Filtering.
2. Turn on Screen Unknown Senders.
3. The rest of the section holds the related settings, in this order: Allow Notifications, Text Message Filter and Filter Spam.

Here is the whole section, top to bottom, with what we suggest:

On iOS 17 and 18 the switch is called Filter Unknown Senders. It moves unknown senders to a separate list but doesn't disable links or offer notification categories.

Default state: Apple turns screening on by default in some countries and leaves it off in others, and some people found it switched on after upgrading to iOS 26. If texts from new numbers seem to have stopped arriving, this is the first thing to check.

3. Allow Notifications: verification codes, personal, transactions, promotions

Screening hides notifications from unknown senders, but you can let some types of message through. Tap Allow Notifications, the row just below Screen Unknown Senders. Apple notes that the options can vary by region; on an iPhone set to English the screen lists these four:

The note at the bottom of that screen explains what allowing a type does: notifications stay hidden for most screened messages, but the types you select show a notification and appear in the Messages list for 12 hours. To keep a sender in your main list for good, mark them as known (next section).

4. Finding the folder and marking a sender as known

1. Open Messages and tap the Filters button at the top of the conversation list.
2. Tap Unknown Senders. Depending on your settings you will also see Spam and, if a filter is on, Transactions and Promotions.
3. Open a conversation you want in your main list and tap Mark as Known. The sender isn't added to Contacts, but their future texts go to your conversation list and their links become tappable.
4. Alternatively, tap the number or address at the top of the conversation and choose Create New Contact. People in your Contacts are never screened or filtered by anything.

Until you do one of these, every future text from that sender keeps going to Unknown Senders. Make a habit of glancing at the folder when you are expecting something from a new number.

5. Screening vs Filter Spam vs Text Message Filter

Three different things sit in the same Unknown Senders section. They stack; they don't replace each other.

Two limits apply to all three, and Apple documents both: filtering only concerns SMS, MMS and (on recent versions) RCS from senders outside your Contacts, never iMessage; and text message filtering doesn't apply to any sender you have replied to three times or more.

6. How it works with AntiSpam or another filter app

When a third-party app is selected as the Text Message Filter, iOS asks it about each text from an unknown sender before deciding where the text goes. AntiSpam answers in one of three ways:

• Spam for scams, phishing, gambling and bulk marketing: the text goes to the Spam folder with no notification.
• Show unfiltered for the messages you must not miss (one-time codes, bank and card alerts, delivery updates, appointment reminders, short personal texts): AntiSpam tells iOS to treat the text as legitimate.
• No opinion for everything else: iOS applies its own rules, which with screening on means the Unknown Senders folder.

7. Troubleshooting

• A code or a delivery text never arrived. Look in Filters → Unknown Senders. Then, in Settings, turn on Verification Codes and Transactions under Allow Notifications, and tap Mark as Known for that sender.
• I turned screening on and now a friend's texts vanish. Their number isn't in your Contacts. Save it, or open their conversation in Unknown Senders and tap Mark as Known.
• Links in a text are greyed out. That is screening protecting you. If the sender is legitimate, Mark as Known; the links become tappable.
• Spam still shows in my main list. Check that the sender isn't in your Contacts and that you haven't replied to them three or more times. Then make sure Filter Spam is on and, if you use a filter app, that it is selected as the Text Message Filter. Restart the phone once after changing the filter.
• New folders called Transactions and Promotions appeared. iOS adds them whenever an SMS filter is active; no app can remove them. AntiSpam doesn't put anything in them; it only decides spam or not spam.
• I want texts only from my contacts, full stop. Apple suggests Screen Time's communication limits for that. It is drastic: no codes from new services either.