Telefonica's Chairman and CEO Cesar Alierta (R) speaks with Vodafone's CEO Vittorio Colao during a news conference at the Mobile World Congress in Barcelona February 25, 2013. The GSMA Mobile World Congress, representing the interests of the worldwide mobile communications industry, will take place from February 25 to 28 in Barcelona. REUTERS/Albert Gea (SPAIN - Tags: BUSINESS TELECOMS)