Method protecting a computer by adding a lock function to a mobile phone universal interface

A method of protecting a computer by adding a lock function to a mobile phone universal interface, comprising the steps of:

• installing a lock software in a mobile phone for locking a universal interface thereof, and
• installing a driver program in a computer for driving said lock software, and
• activating a protection program, when said lock software of said mobile phone is functioning and the mobile phone is connected to another universal interface of said computer through a transmission wire;
• whereby, after said computer is disconnected from said mobile phone, said computer displays an inquiry window to ask whether to lock said computer or not;
• if a yes answer is inputted, said computer enters into a protected mode and will be activated into a normal mode only when said mobile phone is reconnected with said computer through said transmission wire and is confirmed as a unique identity.