<p>The Telephone Preference Service (TPS) is a free service and more than 19.5 million numbers are currently registered with the TPS. The Information Commissioner's Office (ICO) considers complaints and can issue a monetary penalty of up to £500,000. Since January 2012, the ICO has issued four substantive monetary penalties totalling £360,000 and action against other organisations is also under current consideration. Additionally, in spring 2014 the Office of Communications (Ofcom) will be reviewing the effectiveness of the TPS in preventing unwanted calls and we will consider Ofcom's findings to determine whether further action is necessary:</p><p>http://stakeholders.ofcom.org.uk/consultations/silent-calls/joint-action-plan</p>