In January 2018, it was reported that Sting had joined the board of advisors of an impact investing fund of JANA Partners LLC named JANA Impact Capital, aimed at serving environmental and social causes. On 6 January 2018, JANA Partners, together with the California State Teachers' Retirement System issued a public letter imploring Apple Inc. to take a more responsible approach towards smartphone addiction among children. The letter cited several pieces of evidence that show that smartphone use by children increases the risk of their having mental health problems, and worsens academic performance.