When Verizon Wireless works with an outside law firm on a matter, it keeps a close watch on whether the diverse attorneys the firm says are being assigned to its cases are actually doing the work — and getting credit for it.That’s according to Angela B. Frye, general counsel of Verizon’s Great Lakes market. She said the company keeps track of what lawyers are working on matters to ensure firms aren’t putting women, LGBT attorneys or attorneys of color on cases as placeholders to meet the company …