[GRI satisfaction surveys, by means of interviews: ■ the relative survey relates to consumer customers, own customers and competitors’ customers - conducted every month since June 2017 (interviews to an online panel6), with data consolidation every quarter - which measures the general satisfaction of customers within the Company and its contact points (e.g. sales structures, call centers, digital channels, coverage and quality of the network and, with regard to internet connections, websites tariff plans and offers, top ups and billing), Net Promoter Score; ■ the Call Centre Cold Survey, carried out once a month through telephone interviews, involving the company's corporate mobile customers who have contacted the call centre in the previous 15 days.