Xo — Block Unwanted Calls

Block unwanted calls by prefix, country, or unknown numbers. Install and block.

Stop unwanted calls — on your terms.

Xo blocks incoming calls in real time based on rules you set. No subscriptions, no shared databases — just your rules running locally on your device.

Install takes under a minute. Set your first rule in 30 seconds.

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HOW BLOCKING WORKS
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Three blocking types, combine as many as you want:

• By prefix — Block any area code or number pattern (e.g. all 0800 toll-free spam, specific DDD codes)
• By country — Block all calls from a country using its dial code (+1 US, +44 UK, +55 Brazil…)
• Unknown callers — Block anyone not saved in your contacts

Rules use OR logic: a call is blocked the moment any active rule matches.

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REAL-TIME PROTECTION (ANDROID)
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On Android, Xo runs as a Call Screening Service — calls are intercepted before your phone even rings, even with the app closed in the background. No delay, no missed blocks.

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SMART CONTEXT PROFILES
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Automatically switch to stricter blocking based on your context:

• Car mode — activates when your phone connects to your car's Bluetooth audio
• Work mode — triggers via a BLE beacon at your workplace
• Custom location — set a pin on the map with a radius; Xo activates the right profile when you arrive

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SLEEP MODE
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Set a time window for your sleep hours. During that window, only favorites and emergency contacts get through — everyone else is silently blocked.

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TRAVEL EXCEPTIONS
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When Xo detects you've changed region or country, it suggests a temporary whitelist for local numbers — so you receive calls from local businesses while traveling, without weakening your permanent rules.

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SPOOFING ALERTS
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If a call shows a local area code but originates from a different region, Xo flags it as suspicious in your history. An alert, never an automatic block — no false positives.

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FULL CALL HISTORY
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Every call is logged — blocked or allowed — with the exact reason. Filter by type (prefix, country, contacts, suspicious) and understand exactly what Xo is doing at all times.

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PRIVACY FIRST
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All blocking logic runs entirely on your device. Your call log never leaves your phone. No account required for core features.

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Download Xo, set your first rule, and stop unwanted calls today.