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With identify, the call rings, but you'll see “Sales call (400)” (or the label you choose) on screen and decide whether to answer. With block, 400 calls don't ring or show up, and the caller never knows. With off, they come through like any other call.

Wait a few seconds after installing the app and check again. If it still doesn't appear, restart your iPhone; as a last resort, delete and reinstall the app.

The app loads a million numbers into iOS (every number starting with 400). The first load in identify mode can take a few seconds, and the app shows its progress. After that, switching between identify and block is much faster.

No. iOS doesn't tell apps which calls it blocks, and the app can't access your call history. If you'd rather know who called, use identify mode: 400 calls will show up with their label.

The 400 rule applies to sales calls made in Spain. Calls from other countries, or from companies breaking the rules, can still use other numbers. Our guide to the 400 prefix explains what you can do.

You have three options:

• Focus: Settings › Focus › (for example, Sleep) › Focus Filters › Add Filter › No, gracias, then choose the mode.
• Control Center: add the “400 calls” button to switch from identify to block with one tap.
• Siri and Shortcuts: say, for example, “Block sales calls with No gracias”, or use the action in the Shortcuts app.

Yes. You can use both at the same time.

No. Everything happens on your iPhone. Read the privacy policy.