Truecaller has transformed how we handle calls by helping users identify unknown numbers, block spam, and trace caller details. But how does it really work? The app uses crowdsourced data from millions of users. Once you install the app and grant permission, your contacts are uploaded to Truecaller’s servers. Using complex data matching algorithms, names get assigned to numbers-even if the caller isn’t saved in your phone.

If even one of your contacts uses Truecaller, your number might already be in their system. The app also leverages login access via Gmail, Facebook, or Yahoo to enhance its data pool. While it offers features like spam detection, reverse lookup, and caller location, it has drawn criticism for privacy concerns and dependence on internet access.

Truecaller assures users they can unlist their number via its website, offering some control. Despite debates, its effectiveness in identifying and blocking spam makes it a go-to solution for millions.