The network was initially developed primarily by ITT, and grew following the system's nationalization in 1948 and the creation of the ENTel State enterprise. Its limitations notwithstanding, ENTel gave Argentines the widest access to phone service in Latin America. Following ENTel's privatization in 1990, a new numbering plan was enacted, and the number of lines grew to cover the majority of households. A sizable minority of households, do not have land line telephone service, however. The growth of the mobile telephone market since the beginning of the economic recovery in 2003 has been impressive, with new customers now preferring a comparatively cheap cellular phone to land line household service.