The reason we look at a cellphone or computer and conclude design is because we are instinctively comparing these manufactured devices to non-manufactured objects found in nature. It's essentially a form of pattern recognition.
and this is why the flagellum is evidence for design, since its very similar to motors made by humans:

(image fromhttp://www.biologyexams4u.com/2012/10/difference-between-prokaryotic-flagella.html)
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