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Xiaomi

Xiaomi: Block Calls from Unknown Numbers Automatically

When a caller shows up as Unknown or Private, your Xiaomi phone has no caller ID to check against a blocklist entry. Instead of rejecting these calls by hand every single time, you can have the Phone app reject them automatically before they ring through.

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Android 11 · MIUI
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Xiaomi

Block Calls from Unknown Numbers auf Xiaomi

Calls tagged as Unknown or Private number arrive without a caller ID, so MIUI cannot match them against your contacts or an existing blocklist entry. Standard call blocking only works on numbers that are actually visible, which is why hidden callers keep getting through even after you block every number you can see.

MIUI has a dedicated filter for exactly this case, built into the same menu as your regular blocked numbers list, so no third-party app is needed.

Open Phone, tap the Menu icon, then go to Settings. Select Blocked numbers and enable the Unknown option. From this point on, every call without a transmitted caller ID gets rejected before it reaches your lock screen, and the caller is sent to a busy signal or your carrier voicemail.

There is one trade-off. Some legitimate calls, such as certain business lines, hospitals, or international numbers, also arrive without caller ID and get blocked the same way as spam. If you are expecting a call from a source that regularly shows up as private, turn the filter off beforehand or ask the caller to use a number that transmits an ID.

Frequently asked questions

Yes. MIUI cannot tell the difference between a spam call and a legitimate business line if both arrive as Private number. If you rely on a service that regularly calls this way, keep Unknown disabled or check with them about using a visible number.

Compatible devices

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Android 11 · MIUI

Xiaomi A1Xiaomi Black Shark 2 ProXiaomi Mi 10 5GXiaomi Mi 10 LiteXiaomi Mi 10 Pro 5GXiaomi Mi 5Xiaomi Mi 8Xiaomi Mi 8 ProXiaomi Mi 9Xiaomi Mi 9 LiteXiaomi Mi 9 ProXiaomi Mi 9 Pro 5GXiaomi Mi 9 SEXiaomi Mi 9TXiaomi Mi 9T ProXiaomi Mi Max 2Xiaomi Mi MIX 3Xiaomi Mi Note 10Xiaomi Mi Note 10 LiteXiaomi Mi Note 10 ProXiaomi Mi Note 2Xiaomi Mi Pad 3Xiaomi Mi PlayXiaomi Mi5s PlusXiaomi Poco F2 ProXiaomi Redmi 1SXiaomi Redmi 3SXiaomi Redmi 4 PrimeXiaomi Redmi 4 ProXiaomi Redmi 4aXiaomi Redmi 4XXiaomi Redmi 5AXiaomi Redmi 6AXiaomi Redmi 8Xiaomi Redmi 8AXiaomi Redmi 9Xiaomi Redmi 9AXiaomi Redmi K20 Pro PremiumXiaomi Redmi K30Xiaomi Redmi K30 ProXiaomi Redmi K30 Pro ZoomXiaomi Redmi Note 8Xiaomi Redmi Note 8 ProXiaomi Redmi Note 8TXiaomi Redmi Note 9Xiaomi Redmi Note 9 ProXiaomi Redmi Note 9 Pro MaxXiaomi Redmi Note 9SXiaomi Redmi Y3

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