Truecaller is a smartphone application that has features of caller ID, call-blocking, flash-messaging, call-recording (on Android up to version 8), chat and voice by using the Internet.

[9][10] On 18 September 2012, TechCrunch announced[11] that OpenOcean,[12] a venture capital fund led by former MySQL and Nokia executives (including Michael Widenius,[13] founder of MySQL), were investing US$1.3 million in Truecaller to push Truecaller’s global reach.

[14] Truecaller said that it intended to use the new funding to expand its footprint in "key markets"—specifically North America, Asia and the Middle East.

[16] In October of the same year, they received US$60 million from Niklas Zennström's Atomico investment firm and from Kleiner Perkins Caufield & Byers.

[4] Truecaller has launched the Covid Hospital Directory keeping in mind the increasing cases of corona infection in India.

Indian data privacy act which will come into force in later 2024 is also expected to negatively impact Truecaller in India.

When this is in force, Truecaller will not be able to collect and use unconsented data which powers their caller ID database.

[29] E Hacking News reported the group identified 7 sensitive databases it claimed to have exfiltrated, primarily due to an unmaintained WordPress installation on the servers.

On 18 July 2013, Truecaller issued a statement on its blog stating that their website was indeed hacked, but claiming that the attack did not disclose any passwords or credit card information.

[30] Truecaller uploads users' stored contacts to their servers to form a database of phone numbers.