The company Apple Inc. entered in 2007 the smartphone market and their newest technological achievement of the mobile technology, introduced in October 2011, is called iPhone 4S and has numerous high-tech characteristics. One of them is Retina Display, which is the highest-resolution phone display ever launched. Our study was conducted in the form of a research on the interdependency among typefaces and type sizes, with the purpose of drawing conclusions and making recommendations how to achieve the best possible legibility on a mobile screen. Four different typefaces were tested (one old-style, one transitional, one modern typeface and one sans-serif typeface) in four different sizes (6, 8, 10 and 12 pt) and two device positions (vertical and horizontal). The legibility research was performed with the help of readers who read the text comprised of between 120 and 130 words and the speed of reading was calculated. The results of the study show that it is necessary to consider the chosen typeface and its size to ensure text legibility. At the type size 6 pt, the time of reading was the longest, while the text was read the fastest at 12 pt, regardless of whether in the vertical or horizontal position.
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