For one specific number that keeps calling, block it straight from the call history or the conversation (Solution 1): it is the fastest route and covers calls, messages and FaceTime at once. For a flood of different numbers, blocking one by one is pointless: turn on Silence Unknown Callers, which sends anyone not in your contacts straight to voicemail (Solution 3). For texts, use unknown-sender filtering, which moves them to their own tab without deleting anything (Solution 4). Report what arrives as junk (Solution 5). And understand the limit: a lot of telemarketing uses spoofed numbers, different on every attempt, and blocking numbers does nothing against that (Solution 8). Never reply, never press a key and never call back an unknown number: that confirms the line is live.
What causes this problem
- Your number ended up on an auto-dialling list, usually leaked through a sign-up form, a promotion or an online purchase.
- Auto-dialling by number range, where the system calls entire sequences without knowing whether the line exists.
- Spoofing of the originating number, so each attempt arrives from a different number, sometimes with the same area code as yours.
- You answered, replied or returned an earlier call, which confirmed the line is active and increased the frequency.
- Signing up for a service or promotion that passes your details on to telemarketing partners.
- A mass-message scam, blasting texts to thousands of numbers hoping a few people click the link.
- Separate the two cases: one specific number that keeps calling, or many different numbers every week. The first is solved by blocking; the second, by filtering.
- Check that your iPhone is up to date, under Settings > General > Software Update. Several of these features only exist in recent versions.
- Keep the date, time and number of the calls that bother you. If you file a complaint with your carrier or a consumer protection body, those details are what count.
- If a message asks you to click a link, hand over banking details, a verification code or a payment, treat it as a scam. Do not reply, do not click and do not call back the number shown in the message.
Solutions, in the order to try them
1Block the number straight from the history or the conversation
This is the fastest route, and the block covers calls, messages and FaceTime from that number all at once. It works well when it is always the same number calling, which is the case with debt collectors, an old contact or a persistent salesperson.
- For a call: open Phone, go to Recents, tap the info button (the letter i in a circle) next to the number and scroll to the bottom.
- Tap Block this Caller and confirm.
- For a message: open the conversation, tap the name or number at the top, choose Info and scroll down to Block this Caller.
- To see and manage the full list, open Settings > Phone > Blocked Contacts. The same list appears under Settings > Messages and Settings > FaceTime.
- To unblock, open that list, swipe the number from right to left and tap Unblock.
- What happens on their end: the call rings once or goes straight to voicemail, and their message shows as sent. They get no notice that they were blocked.
2Block a number that is not in your history
Sometimes you have the number written down but it never appeared in Recents, or you want to block it before it calls. The iPhone has no field for typing a number into the block list, so the way around it is to create a contact first.
- Open Contacts and create a new contact with the number you want to block. Give it a name you will recognise later, such as Block collections.
- Save the contact, open it and scroll to the bottom.
- Tap Block this Caller.
- Check under Settings > Phone > Blocked Contacts that the number made it onto the list.
- If the same nuisance comes from several numbers, add them all to the same contact as extra numbers and block it once.
3Turn on Silence Unknown Callers to stop the flood
This is the feature that actually helps when many different numbers call. Instead of blocking them one by one, the iPhone stops ringing for anyone not in your contacts and sends them straight to voicemail. The call still shows in Recents, so nothing disappears from view.
- Open Settings > Phone and scroll to Silence Unknown Callers.
- Turn the option on.
- Understand what still rings: people in your contacts, numbers you called recently, and numbers that appear in messages or invitations on your device.
- Important warning: schools, doctors, deliveries, banks and services calling from new numbers stop ringing. Get into the habit of checking Recents and voicemail once a day.
- If you are expecting an important call from an unknown number, turn the option off for that day and switch it back on afterwards.
- Save into your contacts the numbers of anyone who needs to reach you without warning, such as your children's school or the delivery service you use.
4Filter unknown senders in Messages
Filtering moves messages from people who are not in your contacts into their own tab, with no notification. Nothing is deleted: you still have access to everything, but your main list stays clean and spam stops alerting you.
- Open Settings > Messages and find the message filtering section.
- Turn on Filter Unknown Senders.
- Go back to Messages: a filter selector now appears at the top, with separate lists for known and unknown senders.
- Check the unknown tab now and then, because verification codes and delivery notices land there.
- In recent iOS versions, that same screen may split the categories further, such as promotions and transactions. If it is there, use it: it pushes most spam out of your main inbox.
- Do not reply or tap anything inside the unknown tab before confirming the message is legitimate. Replying confirms the number is active.
5Report it as junk
Reporting sends the message to Apple and to your carrier, which helps block the source in the future. It does not solve today's problem on its own, but it is quick and helps the filter improve.
- Open a conversation from a sender who is not in your contacts.
- Look for the option to report junk, which appears below the conversation when the sender is unknown.
- Tap report and confirm. The conversation is deleted from the device and the details go to Apple.
- Reporting does not block the number automatically. If you want to block it too, use Solution 1 before deleting the conversation.
- For calls, the iPhone has no built-in reporting. The route is filing a complaint with your carrier or the consumer protection body in your country, with the date, time and number.
6Use Focus modes instead of blocking everything
Blocking and silencing can be too much when the problem is only timing. Focus lets you choose who can reach you and when, without removing anyone from your contacts or risking a missed important call during the day.
- Open Settings > Focus and choose a mode, such as Do Not Disturb, or create a new one.
- Under People, set who can call you even while the Focus is on.
- Turn on the option to allow repeated calls: anyone calling twice within three minutes gets through, which works as a real emergency exit.
- Schedule the Focus by time, so it turns itself on at night and off in the morning.
- Combine it with Solution 3: Silence Unknown Callers handles telemarketing, and Focus handles the hours when you do not want to be disturbed by anyone.
7Reduce how exposed your number is
Blocking deals with what already arrived. To bring the volume down going forward, what works is cutting the sources that feed those lists and never confirming your line is live. It gives no instant result, but it is what makes the difference over a few months.
- Never call back an unknown number and never press a key when a recording asks you to. Any interaction confirms the line exists and makes it worth more to whoever sells lists.
- Do not reply to texts from unknown sources, not even with words like 'stop', unless it is a service you recognise and signed up for.
- Stop handing your number over on sign-up forms, prize draws and promotions that have no need to phone you.
- Check whether your country or your carrier offers an official do-not-call registry and a service that flags nuisance calls. Your carrier can tell you what exists for your line.
- If the problem is a threat, harassment or abusive debt collection, keep the records and take the case to the appropriate reporting channel. Blocking stops the nuisance but does not replace a formal report.
8Understand why blocking does not always work
This is the part nobody explains and the one that saves a lot of frustration: a large share of telemarketing and scam calls arrive with a faked originating number. The dialling system picks any number to display, including one with your area code and the same first digits as yours, so it looks local. Blocking that number achieves nothing, because the next attempt arrives from another one.
- Typical sign: the calls always come from different numbers, many with your area code and a format similar to your own number.
- In that scenario, blocking one by one is wasted effort. The right answer is filtering by rule, not by number: use Silence Unknown Callers (Solution 3) and message filtering (Solution 4).
- If people complain that you called them and you did not, your number is being used as a fake origin by someone else. That is not a break-in on your iPhone, and no setting on the device fixes it.
- There is no setting that blocks every unknown number while still letting the legitimate ones through automatically. Any filter is a trade between peace and the risk of missing a call.
- Be wary of apps promising to block every kind of phone spam: many want access to your entire address book and call history, and the privacy cost usually outweighs the benefit.
Applies to
| System | Status |
|---|---|
| iPhone on iOS 17 and iOS 18 | Confirmed |
| iPhone on iOS 15 and iOS 16 | Confirmed |
| iPad and Mac on the same Apple ID | The blocked list syncs between devices signed into the same account |
Menu names can change slightly between versions. If a step above does not match what you see on screen, the official support page from the manufacturer has the most current wording for your version.
Frequently asked questions
Last checked: Aug 10, 2026 · We review this guide whenever the manufacturer changes the process.