"Anapandites Kliseis" (Unanswered calls) is the first single from Elena Paparizou as a solo singer. "Anapandites Kliseis" was released on 28 December 2003 and was followed by Paparizou's first solo album Protereotita released in June 2004. The song was written by both Christos Dantis and Vangelis Konstantinidis. The CD single was certified Gold in Greece.
The SMS Remix of the song was released as a promotional single and was given out with issues of Celebrity Magazine.
Paparizou performed a new version of "Anapandites Kliseis" featuring Christos Dantis for MAD TV's MAD Video Music Awards.
In the music video for "Anapandites Kliseis", Paparizou is in a club with a number of other people, all dancing. Paparizou is seen dancing around and singing multiple times throughout the video. She is calling someone but cannot get an answer. In addition to the title track, a music video for "Treli Kardia" was also made.