Samsung's new Galaxy S4 smartphone is an excellent device from a hardware standpoint. Measuring 5 inches diagonally, the screen is slightly larger than that on its predecessor, the Galaxy S III. Yet the S4 is a tad lighter and smaller overall. The S4's display is also much sharper, at 441 pixels per inch compared with 272 on the S III. The S4 has one of the sharpest screens out there.
The Android operating system it runs is excellent, too, and in recent years the Google-made system has become a healthy competitor to Apple's iOS system for iPhones. Like most Android phones, the S4 comes with a suite of useful Google apps, including Gmail, YouTube, Google Maps and the voice assistant Google Now. Because Google lets device makers customize Android to suit their needs, Samsung and others have been adding their own distinguishing features.