This project is actually explaining about the importance of online sim cards registration, which has contributed more effectively towards in reduction of phone crime in Nigeria. The Nigeria communication commission (NCC), has taken a drastic method in putting a stop of every criminal act made, in the use of mobile phone. The sim registration process, has not only help in finding out every illegal or criminal act committed by various individuals, but also has contributed to the nation (Nigeria), in knowing the volume or the number of persons using a sim mobile phones. This process has also help telecommunication operators or industries in finding out the specific crime made in the use of sim mobile phones. For example, knowing the exact location, address, name, place and even time of calls made by the individual will be trace out. The Association of Telecommunication companies of Nigeria (ATCON) went into debate by asking the various communication operators to choose between the security of the country and their business. This actually came into conclusion for the sim card registration to take effect.