No, graciasHow to block 400 calls on iPhone
Since 17 October 2026, sales calls in Spain come from numbers starting with 400. Here are all the ways to stop them on an iPhone, with their pros and cons.
Summary
| Option | Covers all 400 numbers | Other calls still get through | Cost |
|---|---|---|---|
| An app like «No, gracias» | Yes | Yes | Free |
| Silence Unknown Callers | Yes | No: it silences everyone not in your contacts | Free |
| Block numbers one by one | No (there are a million) | Yes | Free |
| Ask your carrier | Depends on the carrier | Yes | Depends on the carrier |
1. With an app: identify or block every 400 number
iOS lets an app load a list of numbers into the system to identify or block them. «No, gracias» loads the whole 400 range (a million numbers) and lets you choose:
- Identify: the call rings, but you'll see “Sales call (400)” on screen.
- Block: it doesn't ring or show up, and the caller never knows.
- Let it switch on its own: block while you sleep or work with a Focus filter, from Control Center or with Siri.
It's free, has no ads and can't see your calls or contacts: iOS does the filtering. After installing it, turn it on in Settings › Apps › Phone › Call Blocking & Identification.
2. Silence Unknown Callers
In Settings › Apps › Phone › Silence Unknown Callers, your iPhone silences calls from numbers that aren't in your contacts and sends them to voicemail. It stops 400 calls, but also your doctor, a delivery driver or any new number. It can work at night, but as a permanent fix it's usually too much.
3. Block a single number
In the Phone app, go to Recents, tap ⓘ next to the number and choose the block option at the bottom. It works, but only for that number: each company uses many different 400 numbers.
4. Ask your carrier
Some carriers offer to block the 400 range on request. Ask yours: it works on any phone, but it's all or nothing (you can't identify instead of block, or change it by time of day).
5. iOS call screening
Recent versions of iOS can ask unknown callers to say who they are before your phone rings. It helps with any unknown caller, but it can't tell whether a call is a sales call. You can use it together with «No, gracias».
Frequently asked questions
If I block 400 numbers, will I stop getting calls from my bank or energy company?
No, unless they're calling to sell you something. Customer service calls don't have to use 400; only sales calls must.
Does the app need to be open?
No. The app only loads the list into iOS; from then on the system identifies or blocks calls, even with the app closed.
Will I know about blocked calls?
No. iOS doesn't tell you about the calls it blocks. If you'd rather know who called, use identify mode.
What if a sales call comes from a number that isn't 400?
If the call is made from Spain, it breaks the rules. Our guide to the 400 prefix explains how to object and complain.