Ever wondered why Android phones are long and narrow, while iPhones are more square. Well it has to do with screen ratios, and perhaps what Google and Apple think users would be using their phone for.
The iPhone resolution is 960×640. This gives a ratio of 3:2, and is close to an A4 paper page. Where as the Google nexus prime has a ratio of 1280×720. This a ratio of 16:9, and this is shape that modern TVs use when they describe themselves as HDTV. So there is a lot of content available in this format, TV programs, TV series and some movies.
Of course not all Android phones have a 16:9 widescreen format, but the latest Android phones do seem to be sticking to this form factor.