A mobile phone is, in today’s age, a man’s best friend. Hence it is no surprise that all major designers of luxury products and otherwise join the ship that is set to sail the waves to create unique pieces of accessories to suit every man and woman’s needs. Swiss watchmaker Franck Muller is planning to celebrate its 20th anniversary by launching a special series of iPhone 4 cases. Each case features an intricate interlocking digit motif. There will be six options, including three in tonal colors, one in two tones, and one multicolored. These will be offered through Beams in Japan at the cost of around $1,268.