System Interfaced with Mobile (SIM) is the concept of using Wi-Fi to control the activities of the computer system. Now the most common usage of giving input to the system is through a optical mouse and a QWERTY keyboard. Though these have been used for many years for now, it has resulted in repetitive stress injuries to fingers along with restriction of blood circulation due to the same posture for many hours. here introducing a concept to reduce these problems as much as possible through the use of mobile phones. The suggested method for minimizing these effects is interfacing mobile with keyboard to perform the basic input functions such as, opening a text document, clicking on the items in the menu bar from a considerable distance. The joystick provided in the direction button is used for the mouse functions for cursor movement in all directions. The main application of this project is that the display of the monitor is brought to focus in the mobile phone display and the system can be operated from anywhere in the building or house with a mobile .