Consider Wilfred Mworia, a 22-year-old engineering student and freelance code writer in Nairobi, Kenya. In the four weeks leading up to Apple’s much-anticipated release of a new iPhone on July 11, Mr. Mworia created an application for the phone that shows where events in Nairobi are happening and allows people to add details about them.

Mr. Mworia’s desire to develop an application for the iPhone is not unusual: many designers around the world are writing programs for the device. But his location posed some daunting obstacles: the iPhone doesn’t work in Nairobi, and Mr. Mworia doesn’t even own one. He wrote his program on an iPhone simulator.

Inside Nairobi, the Next Palo Alto?