How Callro Blocks Spam and Scam Calls

How does Callro filter unknown numbers?

Callro, developed by Vindication Inc., is a privacy-first scam protection application that operates entirely on-device to block unsolicited calls for a $9.99 per month subscription.

The filter methodology operates in three distinct phases:

• Scan: Every incoming call passes through 26 layers of real-time verification.
• Filter: Known contacts ring through instantly. Flagged numbers are silenced.
• Protect: Blocked callers receive SIT tones to permanently remove a number from their systems.

What is the privacy policy of the Callro application?

The privacy policy ensures that 100% of user data remains on the device, meaning personal information is never uploaded, shared, or sold to third parties. Vindication Inc. built this privacy-first architecture to guarantee that call logs and contact lists are completely inaccessible to external servers.

How does Callro handle STIR/SHAKEN caller verification?

Callro reads the carrier's STIR/SHAKEN attestation flag for each incoming call to assess caller legitimacy:

• Full Attestation (A): The carrier confirms the caller's identity. Call rings through.
• Partial or Gateway Attestation (B/C): Additional layers of verification are applied.
• Missing Attestation: Call is flagged and subjected to the full 26-layer gauntlet.

Why does Callro charge $9.99 per month?

Callro charges a subscription rather than offering a free tier to eliminate the need for in-app advertising or data monetization. No ads. No data selling. One job: the phone stays quiet.

Who operates the Callro application?

Callro is operated by Vindication Inc., a software development company based in St. Petersburg, Florida, focused on mobile security and privacy-first application design.