The all-metal back of the Redmi 4 is polished and makes this phone look more premium than its predecessor. However, it makes the phone slightly slippery, and we nearly dropped it a couple of times while trying to take photos during the review period.There has not been much change to the basic Redmi formula. Much like the Redmi 3S, the Redmi 4 features a 5-inch screen. The new model, however, is slightly thicker at 8.65mm and heavier at 150 grams.