(Reuters) – Mobile service provider NII Holdings Inc, reporting its ninth quarterly loss in a row, said on Monday it may have to file for bankruptcy after struggling to compete in Brazil and Mexico. “Despite the actions we’ve taken to improve our operational performance, we have fallen short in our efforts, leaving the company with a liquidity position that is not sufficient to support the business,” Chief Executive Steve Shindler said in a statement. The company, which operates in Latin America under the Nextel brand, ended the second quarter with a net debt of $4.8 billion and with $1 billion in cash and investments. NII is facing intense competition in Brazil and Mexico – its largest markets.