Claro is the market leader with over 53% of the market share. However, this information is based on official statistics published by the National Telecomunications Institute (TELCOR) back in 2013  and no newer official stats were found. It id advised to ask the country to provide fresh statistics. https://telcor.gob.ni/participacion-de-mercado-en-las-telecomunicaciones/Note: Claro appears as Enitel, which is the old name of a company that was merged in 2009 to form Claro.