Answering phone calls is an activity that many people do not associate with danger. However, as it has been repeatedly it turned out, the people who call us, are absolutely foreign, and their intentions are not the best. These calls can later cause trouble, this one as extorting money, and also phishing of personal data. In order to prevent from these situations, necessary to check who called. Such activities are extremely easy and require only simple activities on the Internet. Anyone can guarantee their own safety by following the rule of checking incoming calls and not picking up this which are not guaranteed to be safe. Protecting your security is important, even when it comes to answering phone calls. This action can definitely increase the security of telephone calls.