Sakthi in Siva's heart) also known by the initialism SMS, is a 2009 Indian Tamil-language romantic comedy film written and directed by debutant M. Rajesh.

Despite initially gaining mixed reviews, it became highly successful at the box office and has since achieved cult status.

He pays a visit to the airline company where Sakthi claimed to work, with his mother Kalyani and best friend Vivek tagging along.

A series of humorous incidents happen as Siva teases Sakthi live on her radio show and gets her in trouble with her father; and she retaliates by tattling on him to his family and using him as a driver.

Sakthi reveals her feelings by planning a surprise birthday party for Siva but learns that he had lied about his birth date.

Siva grows upset as well, fights with his mother and sister, and continuously destroys Vivek's new mobile phones, but everyone eventually forgives him.

[1][2] The soundtrack, composed by Yuvan Shankar Raja, released on 25 January 2009, featuring 7 tracks with lyrics written by Na.

The album grew in popularity, with particularly the song "Oru Kal" getting widely noticed,[3][4][5] while also garnering accolades and several awards and nominations for its composer Yuvan Shankar Raja and its lyricist Na.

[8] Sify wrote, "If originality and a solid screenplay isn't your top priority and you want a bit of candy floss some sentiments laced with lots of comedy, then you might dig this one".

[9] Rediff wrote, "SMS has all the makings of a runaway hit with its cocktail of humour, love and the eternal man-woman conflict.