The study, while based on an extremely small sample size, makes for interesting reading.However, we're not sure how accurate the results are as only 20 users in each group were studied.
The researchers found that while iPhone users entered text as fast as their counterparts, they made significantly more texting errors. iPhone users made 5.6 errors per message, while keyboard users made 2.1 mistakes per message and numeric phone typers made 2.4 mistakes.
The iPhone has only one key. Users type text messages on a keyboard that appears as an image on the phone's screen.
Surprisingly, the study found that iPhone texters don't improve with experience. The researchers also asked users in the other groups to send text messages using the iPhone. These novice iPhone users made mistakes at the same rate as people who have owned iPhones for at least one month, the study found.
Source: IT World