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In the recent years, the technologies develop rapidly. Mobile devices have become very important tools in the modern world. They combine many functions like OS, camera, video, internet, Bluetooth, calendar, address book, application. They contain copious personal information, high mobility and powerful hardware, so the crimes of smart phone increase rapidly. There are many kind of modus operandi increasing. Smart phone has become one of the high technical tools to commit a crime. In view of this, our research will discuss Smart-Phone Digital Evidence Forensics Standard Operating Procedure (Smart-Phone DEFSOP) which was proposed by Prof. I-Long, Lin. Our research will compare with the SOP which was proposed by National Institute of Standards and Technology (NIST). Finally, we will use trusted third party forensics tools to collect, analyze and examine digital evidences. In order to assist proof capacity of digital evidences in the court, we have to authenticate the "integrity", "consistency" and "precision" of the digital evidences.