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A logical fallacy is one that presents an argument that seems correct, but it is false, it does not present evidence that the reasoning to create it was correct and true.
In "Smarter Without Smartphones" we can see an example of a logical fallacy in the phrase "Students who use cell phones in school will lack needed social skills later in life." This fallacy is called Argumentum ad consequentiam, where the author makes an appeal to an ill-justified consequence. In this case, the author states that the lack of social skills will be a consequence of the use of cell phones at school, however, the author does not present any data that proves that this actually happens.