The idea is that according to the Law "On advertising" from 13.03.2006 N 38-FZ
1. The dissemination of advertisements through telecommunication networks, including through the use of telephone, facsimile, mobile telephone communications, is allowed only with the prior consent of the subscriber or addressee to receive advertising. In this case, advertising is recognized distributed without the prior consent of the subscriber or addressee of advertisements if it is proved that such consent was obtained. Advertisement shall immediately cease the dissemination of advertisements to the person who applied to him with such a request.
To prove the addressee's consent no personal data generally speaking difficult. But why with NG — not found anything like it, except that "telephone": in the spring of the following year may be submitted to the state Duma amendments to the criminal code, Laws on personal data and advertising — www.rb.ru/topstory/business/2010/12/02/093631.html