Smart phones are becoming more & more popular because of their unique design, lightweight & compact size. Their various features such as many useful applications like multimedia applications, games etc .and ease to carry from one place to another have added to their popularity. With the wide range of development of smart phones there is increasing demand in the consumption of the smart phones. Due the advanced features, that the smart phone possesses the consumption of battery increases. This paper focuses on the existing development and research in the field of saving the energy of smart phones and the work carried according to the existing system. This shows how cloud is actually working and the consumption of energy by the smart phone.