HOW IT WORKS

Callro spam call filter does its thing quietly behind the scenes, keeping you safe from spam and telemarketers without bothering your daily life. Here's exactly what happens with every incoming call.

The Simple Version

Step 1 Verify: Every call is checked against STIR/SHAKEN certificates to confirm the caller's identity is real.

STIR/SHAKEN: Verified Calls Only

Callro spam call filter also implements the same highly advanced caller verification technology as phone carriers do, STIR/SHAKEN, to confirm the identity of each incoming call and prevent spam calls from getting to you.

Three Steps

Why It Matters

Spoofed numbers and fake caller IDs are caught immediately.

Step 2 Filter: Verified calls ring through. Unverified or suspicious calls are silently blocked.

Step 3 Enjoy: Your phone rings only for trusted callers. Everything else is silence.

You never hear from spammers again.

Peace restored.

The Six Layers of Callro Protection

Layer 1: Instant Blocklist

When a call comes in, Callro instantly consults your personal blocklist and our spammer database. If the offender is a known one, the call is blocked within milliseconds, to the point where they don't even get a first ring.

Layer 2: Trusted Contacts

Any number that you save in your phone contacts gets trusted automatically. Your family, doctor, and your child's school can always get through without any problems. No false positives.

Layer 3: Spoofing Detection

Spammers impersonate local numbers so you are more likely to answer. Callro spots such tricks and automatically blocks calls that try to disguise their real origin.

Layer 4: Pattern Recognition

Auto, dialers make thousands of calls to different numbers every hour. Callro is able to detect their fast, repetitive pattern and marks them as spam even if the number has never been used before.

Layer 5: On-Device AI

Advanced AI will instantly analyze the unknown phone numbers on your device only. Number patterns are verified right away. Data never leaves your device.

Layer 6: Final Decision

Each layer's evidence accumulates into one "Spam Score. " When the score goes over a certain limit, the call gets blocked. You have the option to check each decision.

The "Swiss Cheese" Defense

Each layer contains lots of pores. An ingenious spammer could just about get through one of the filters. However, to get to you, he would have to go through all six layers.

That's really not going to happen statistically. Hence, it's pretty much the way Callro does things.

Privacy First

Your contacts never leave your phone
Your call log stays on your device
Our AI works locally, not in the cloud
We never sell or share your data