Android Spam Call Blocker.Hear the OnesThat Matter.

Free carrier and Android spam filters work off delayed, database-driven number reports — a call has to be reported as spam by other users before it gets flagged, which is why fresh spoofed numbers still get through. Callro's Gauntlet Engine evaluates the call's carrier certificate and behavioral signals in real time, on-device, so it doesn't need to wait for a number to build a bad reputation first. If your phone's built-in filter is already catching everything, you don't need Callro — it's built for people whose free filter is letting spoofed and rotating numbers through.

Download Callro, open it, and protection starts immediately. Your 7-day trial begins automatically — no credit card or payment information needed. After 7 days, subscribe for $9.99/month through Google Play, or the trial simply ends with no charge.

No. Anyone in your contacts always rings through. Anyone you've called recently always rings through. Your doctor, pharmacy, bank, family — always. No exceptions. Only unknown, unrecognized numbers go through the 26-layer Gauntlet.

One: Call Screening. That's it. Callro never accesses your contacts, call history, location, or messages. Everything runs on-device. Contacts, call logs, and audio never leave the device.

Google Play → Subscriptions → Callro → Cancel. Takes 30 seconds. No forms, no retention flows, no guilt trips. We want to earn your subscription every month.

Google Play's standard refund policy applies. You can cancel anytime from Google Play → Subscriptions → Callro → Cancel. If you have issues, email us at support@getcallro.com and we'll help.

Never. Callro uses Android's native Call Screening API — the analysis happens entirely on your device. Contacts, call logs, and audio never leave the device; the app downloads public scam-number database updates and syncs only anonymized, hashed signals. The moment you uninstall the app, all on-device data is gone instantly. The small set of anonymized server-side records (such as your trial hash) expire on their own schedule per the Privacy Policy.

No. Callro screens CALLS, not texts. Text message spam requires a completely different technical architecture that we do not build.

Yes — Callro runs on Samsung Galaxy and Google Pixel devices on Android 10 and above.

No. Callro uses Android's native Call Screening API to reject spam calls before your phone rings. The call is blocked at the OS level and doesn't reach your device — including your voicemail, in almost all cases. (Voicemail handling ultimately depends on your carrier, since it happens outside the app.)

No. Once set as your default Call Screening app, it runs silently in the background at the OS level. You can close the app and forget it's there.

No. Google Voice uses its own proprietary routing that bypasses Android's native Call Screening API. Callro only screens calls to your actual carrier SIM number.

No. The Gauntlet Engine only activates briefly when an unknown call comes in — there's no continuous background polling or location tracking.