Apple Inc introduced two new iPhones on Tuesday including the "iPhone 5C" that comes in five colors and starts at $99 with a contract, priced to bring one of the industry's costliest smartphones within reach of the masses in poorer emerging markets. Chief Executive Tim Cook kicked off the event at the company's Cupertino headquarters which also ushered in the pricier iPhone 5S. Shares in Apple, which had been in negative territory most of the morning, briefly went positive and were down just 0.5 percent at $503.48/Reuters. More here. (AP photo: Craig Federighi, senior vice president of Software Engineering at Apple, speaks during the new product release in Cupertino, Calif., today)

Question: How often do you upgrade your cell/smart phones?