Samsung Galaxy S4 M919 16GB T-Mobile 4G LTE Smartphone - Black Mist With its 5-inch full HD super AMOLED display, the Samsung Galaxy S 4 SGH-M919 smartphone is truly a delight to watch The Samsung Galaxy S4 has fast 1.9 GHz speed, quadcore processor, so the multitasking goes easily, without any problem This smartphone has 16 GB internal memory, which can be further upgraded with a microSD card Take brilliant photos with its 13 MP camera, and make video calls with the 2 MP front camera The Galaxy S 4 is also equipped with WiFi and Bluetooth connection so you can transfer multimedia and chat with friends all the time Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.