You need to research the companies products you are selling. If there is a product already made and a companies owns and sells it, dont waste your time. If you are using a companies name to sell a product, for example, "Samsung Galaxy S3 S III Flip Phone Cover Black Leather", than you run the risk of Samsung taking down your listing because you are profiting by using their name to make money. Some may say its rare others may not.
I know of someone who sells hundreds of thousands of phone cases over a few accounts and has run into an issue (iphone), but from what I know its pretty rare, and was believed to be from a competitor. I would say it is safe, but you will want to avoid selling a particular phone case that a company makes, owns, produces, and sells.
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