NII Holdings is a telecommunications company operating in Brazil, Argentina, and Mexico under the Nextel brand. It has experienced declining financial performance in recent years due to problems such as loss of subscribers, low market share, decreasing revenue, and high customer turnover. A root cause analysis identified lack of competitive technology, low capital compared to competitors, loss of existing subscribers, and lack of competitive edge as key issues. Potential solutions to address the problems include selling the Mexico market, expanding services on an upgraded network, and implementing a new marketing and promotion plan.