The Galaxy S4 boasts a large 5-inch HD Super AMOLED panel with a 1,920x1,080-pixel resolution; that works out to a pixel density of 441 pixels per inch. Colors are rich and bright, though the handset doesn't seem to shine quite as luminously as some LCD displays.
A slightly slimmer, more rectangular Galaxy S4 design gives the phone a slightly boxier, sturdier profile. The GS4's controls, while still made of polycarbonate plastic, have been designed to appear more premium than the S3's rounded bubble buttons.
A large removable battery is a claim to fame over the rival HTC One, and the GS4's microSD slot is another. The battery pack is higher-capacity than the Galaxy S3's, being 2,600mAh compared with the S3's 2,100mAh.
Another interesting new feature of the Galaxy S4 is especially handy when you're watching a video. Namely, the screen can interpret eye movements to pause a video when you look away and resume playback when you start paying attention again.
Like its predecessor, the phone features Samsung's home-grown S Voice vocal search feature, which you activate by holding down the home button. Driving mode is a new addition you can activate through the app's context menu.
Samsung has poured a lot of hardware and software effort into creating a different, yet utterly familiar phone to carry on its Galaxy S line. This fourth installment is a sure-fire hit. Don't forget to check out CNET's video tour, and all the pros and cons in this full Galaxy S4 review.