A 3D printed Apple logo is seen in front of a displayed cyber code in this illustration taken February 26, 2016. Apple Inc's stance on privacy in the face of a U.S. government demand to unlock an iPhone belonging to one of the San Bernardino attackers has raised awkward questions for the world's mobile network operators. Top executives at this week's global telecom industry gathering in Barcelona admit they are constantly trying to strike a balance between the expectations and demands of their own users, government regulators and national politicians. REUTERS/Dado Ruvic/Illustration