Sim ownership can be checked by consulting relative sim branch or by concerning with PTA( Pakistan telecommunication authority. If someone want to check sim details than it should must concern relative government institution. Misuse of sim data is illegal and may be used for illegal activities. Use of illegal sim data is violation PTA laws and different punishment are there. Requirements for checking sim details include name of owner, CNIC no of owner, residential place, calls details and location of user. Total no of sims registered on someone name and  sim company detail   also be checked.