By Reuters Staff 1 Min Read FILE PHOTO: A T-Mobile logo is advertised on a building sign in Los Angeles, California, U.S., May 11, 2017. REUTERS/Mike Blake AMSTERDAM (Reuters) - T-Mobile Netherlands said on Wednesday it will invest at least 700 million euros ($832 million) to build and offer fibre optic networks in Dutch cities together with Open Dutch Fibre, a joint venture between KKR Infrastructure and Deutsche Telecom Capital Partners. The project aims to reach 1 million households within five years, it said. T-Mobile competes against KPN and VodafoneZiggo in the Netherlands. In March, KPN announced a 440 million euro partnership with pension fund giant ABP to speed up its fibre optic rollout, targeting customers in under-served areas.