Samsung's new smartphone contains multitudes.

The Galaxy S 4's touchscreen doesn't need to be touched to respond to your actions. Its software looks less like Android than almost any other phone running Google's operating system, but the thing ships with a newer version of it, 4.2, than almost all others. And its 5-inch screen outsizes the 4.8-in. display of the earlier Galaxy S III, but it's smaller and lighter than Samsung's flagship phone of last year.

And like its best-selling predecessor, the S 4 invites an assessment from multiple perspectives.

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