Is it safe to during a telephone conversation? But some it may seem that it is impossible to design who will call us, there are ways to monitoring the number which is trying to make a call. Such methods gain fame not exclusively due to numerous advantages, which provides taking care of own safety but more due to simplicity their availability. Individual, who has access to the Internet on a smartphone or laptop can verify who called without a sample. Such strategies are easy, you don't need to enter any more information apart from this, which number tried to interact with you . These are techniques, which you can apply yourself, but this take care of your own safety. Unknown numbers can ringing with different ideas. Sometimes it's just a mistake, but much more often these unrecognized, unknown phones ringing for the purposes of for example phishing personal, false offers. By using these services and by entering own personal information, you may have serious trouble in later time which cannot be solved, if only you check someone's number. What conclusions can be drawn from this? To defend own.