According to Chicago-based usability consultancy User Centric, users new to Apple's much vaunted iPhone may have difficulty adjusting to the phone's texting style, with its touchscreen described as "potentially problematic" for sending text messages. User Centric tested the iPhone's SMS features with frequent texters, individuals who send at least 15 messages at week, to see how rapidly they could adapt to the iPhone's touch keyboard; all texters either owned a phone with a full Qwerty keyboard or a numeric keyboard and had no previous experience with the iPhone. As part of the test, each participant typed six fixed-length text messages on their own phone and six on an iPhone; the results revealed that Qwerty-keyboard users took almost twice as long to compose messages on Apple's offering as compared to their own phone, with the difference in time persisting for as long as 30 minutes. "
For Qwerty users, texting was fast and accurate. But when they switched to the iPhone, they were frustrated with the touch sensitive keyboard," said Jen Allen, a usability specialist at User Centric.
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