Sulochana Dubey, nicknamed Sulu (Vidya Balan), is a middle-class housewife living in Virar with her family. She enjoys her life to the fullest with her husband Ashok (Manav Kaul) and 11-year-old son Pranav. Sulu dreams of being a working woman, but since she couldn't complete high school, she is unable to apply for white-collar jobs. Her elder twin sisters mock her, seeing Sulu as beneath them due to her education. Ashok works as a manager in a tailoring firm; a frustrating job as everyone apart from him is unreasonable and over the age of sixty. On top of that, the firm is taken over by the owner's grandson, who is extremely rude. Pranav is teased by a group of classmates who sell R-rated magazines and videos.
One day, Sulu wins a contest hosted by her favourite radio station and goes to the station to collect her prize. There, she sees a poster advertising auditions for an RJ, and feels that this is the job she is meant for. Sulu meets the boss, Maria (Neha Dhupia), who finds her extrovert nature intriguing and gives her an opportunity to audition. Sulu laughs throughout the audition but at the end, says 'Hello' in a sensual tone, which impresses Maria. Maria asks if Sulu would be able to do a call-in night show, where people would call her to talk about their problems and she agrees.
Ashok is irritated at first that Sulu took up the job without discussing with him but relents out of love for his wife. On her first day, Sulu faces an annoying caller who tries to change their chat into an obscene one, but is able to tactfully handle it. Next, she gets a request to sing, and excitedly does a song she only sings for her husband. Ashok is annoyed by her behavior, as well as frustrated with his new boss, who treats him terribly. Sulu's family disagree with her show and want her to quit but Ashok stands by her. The show becomes successful and Sulu enjoys her work, growing more worldly and confident. However, Ashok continues taking out his frustrations at home about both his job and hers. Sulu's life becomes high at work and low at home.
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