Sprint Corp will keep investing in its networks even if U.S. regulators adopt stricter "net neutrality" rules as long as they are applied with a "light touch," the company said in a letter to the FCC released on Friday. Sprint's position appears to contrast with other cable and phone companies who have staunchly rejected the possibility that the FCC regulate Internet service providers more strictly under a section of communications law known as Title II, which would treat them more like public utilities.