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I think that's a bit different because there is a capital letter there, just not the first one, so it's visually a bit less weird, but if still go with IPhone at the start of a sentence.
But in the entire Wikipedia article on iPhones, there's not a single sentence starting with "iPhone", which leads me to think that every sentence which would naturally have started with "IPhone" was reworded just to avoid this problem...
Wikipedia seems to be ok with sbt and iTunes, but I don't want to attract attention of the editors.
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