Punnagai Poove (2003)

Outgoing Meera and shy Nithya are best friends since childhood. They share an apartment together in an expansive complex. One day, handsome Venkat moves in with his grandparents, and Meera is smitten She starts to make anonymous calls to him, and he finds himself falling in love with her. A friend suggests that he use caller ID to locate her, which he does. At that time, Meera hands the phone to Nithya to run an errand. Nithya is the face he sees holding the phone, and despite being engaged to Shakti, she likes him too.....