By Ross Kerber BOSTON (Reuters) – A plan by ATT Inc to explain how it shares some customer information with government agencies may not be enough to restore public trust, an attorney for New York State Comptroller Thomas DiNapoli told securities regulators in a letter provided to Reuters on Wednesday. The attorneys letter dated January 6 keeps alive a surveillance debate the telecommunications giant had aimed to settle in December – part of a growing national discussion of privacy rights fueled by the revelations of former government security contractor Edward Snowden. Under pressure from shareholder activists ATT promised last month to publish a semi-annual rundown of things like how many law-enforcement agency requests it gets in criminal cases. DiNapoli oversees the $160.7 billion New York State Common Retirement Fund, which owned 15.7 million ATT shares as of November.