Investigating crimes which was made using computers are very difficult tasks. Most problems are caused by universality of computers or phone functions. Crime may be caused using phone or computer, and these crimes are not so different. In most cases investigator don't know which object was used for the crime. And this knowledge is acquired by forensics - expertise can to determine which object was using for crime. But it must be preceded by another investigative actions. Investigator must identify each object and to determine his properties. These actions can reduce the time of examinations. Also, investigator can reduce the time of examinations providing appointment single examination for any physical evidence.