Truecaller is an app designed to identify callers, block spam, and record calls. The app uses a variety of features, including a caller ID, spam call blocker, AI call scanner, and call recorder. It also offers messaging features, and a virtual assistant that screens calls. Key features of Truecaller:

• Caller ID: Identifies who is calling, even if the number is not in your contacts, and indicates if the caller is a business or a spam number.
• Spam Blocking: Blocks and warns about scammers, telemarketers, and other unwanted numbers, using a real-time updated spam list from millions of users. The app also provides options for blocking spam calls from specific countries, similar number sequences, and other criteria.
• AI Call Scanner: Detects and differentiates between human and AI-synthesized voices to protect users from scams. This feature is activated through a dedicated button within the dialer, merging the call with a secure phone line to record a voice sample for analysis.
• Truecaller Assistant: This AI-powered virtual assistant answers calls, uses speech-to-text to ask questions to callers and identifies if the call is spam, a scam or a robocaller with over 90% accuracy. The Assistant also allows the user to use their voice to let callers hear a familiar voice.
• Call Recorder: Records incoming and outgoing calls, generates relevant subjects for the calls, summarises conversations, and provides written transcripts.
• Messaging: Can be used as a main texting app, with features to identify and block spam SMS, and automatically organise messages into tabs.
• Premium Features: Upgrading to Truecaller Premium provides access to features such as no ads, the Truecaller Assistant, call recording, the AI Call Scanner, profile view tracking, advanced blocking options, call announcements, incognito mode, a premium badge, and 30 contact requests a month.

Truecaller is also available on Wear OS, which makes it easier to block spam calls from your wrist. The app does not upload your phonebook to make it public or searchable. It is used by 383 million users globally. Truecaller collects data such as location and personal information which it may share with third parties. User reviews mention some issues with the app such as messages taking a long time to send, and the AI call screening feature being buggy. Some users also noted that the app had limited features such as a small frequently contacted list.