<p>No such assessment has been made, but we are aware that after ICO issued a large monetary penalty in November 2012 for spam text messages, the monitoring service Cloudmark reported a 10% drop in unsolicited spam SMS text messages. We remain keen to ensure robust enforcement of the regulations, so that companies breaking the rules are caught and penalised.</p><p>Our Nuisance Calls Action Plan that was published on 30 March 2014, details the range of legislative and non-legislative measures being taken forward to tackle nuisance calls and texts and the plan can be viewed at:</p><p>https://www.gov.uk/government/news/nuisance-calls-action-plan-unveiled</p>