The Lost Number font here refers to the font used in the poster of The Lost Number, which is a 2012 action movie about the story of a redemption-seeking English woman going against all odds to save a remote slum in Africa.
The font used for the movie title is probably ITC Bauhaus Light. The font is a commercial one and more details about it can be found here.
Download Bauhaus Font
The Bauhaus font identified above is not available for free, please follow the link above and purchase the font. Meanwhile, you can take a look at our collection of fonts for cars, pop music and apparel as well as round-ups of new & fresh fonts around the web.