... not a desktop 2 011 , World populations billion people, 5.6 billion mobile 2 011 , USA, 327.5/ 310 , 10 3.9% 2009, GER, 10 7/82, 13 0% 2008, UK, 75.7/ 61. 6, 12 3% Source: http://en.wikipedia.org/wiki/List_of_countries_by_number_of_mobile_phones_in_use ... mobile phone for 21 How to develop an innovative program on Mobile st phone What area can we apply this skill for century The mobile phone of the 21 centuty The mobile phone of the 21 centuty It has ... Services It is an Entertainment Device The smartphones problems Difficult to interact Expensive Battery life Social issues Distraction Difficult Interaction Small Screen Icon based ? Too complicated...