There are one very simple answer - screen size along with ARM arch is what matters. Or just simply - if you cannot watch ordinary porn clips on certain mobile

There are one very simple answer - screen size along with ARM arch is what matters. Or just simply - if you cannot watch ordinary porn clips on certain mobile device (small screen, slow cpu) this device worthless for developer. =) iPhone simply outnumbered Nokia N-series and E-series handsets which are worth of development.