Xo — Block Unwanted Calls

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. ────────────────────────── HOW BLOCKING WORKS ────────────────────────── 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. ────────────────────────── REAL-TIME PROTECTION (ANDROID) ────────────────────────── 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. ────────────────────────── SMART CONTEXT PROFILES ────────────────────────── 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 ────────────────────────── SLEEP MODE ────────────────────────── Set a time window for your sleep hours. During that window, only favorites and emergency contacts get through — everyone else is silently blocked. ────────────────────────── TRAVEL EXCEPTIONS ────────────────────────── 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. ────────────────────────── SPOOFING ALERTS ────────────────────────── 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. ────────────────────────── FULL CALL HISTORY ────────────────────────── 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. ────────────────────────── PRIVACY FIRST ────────────────────────── All blocking logic runs entirely on your device. Your call log never leaves your phone. No account required for core features. ────────────────────────── Download Xo, set your first rule, and stop unwanted calls today.