The World's Smallest Smartphone, Sudroid SOYES Android 5.1 OS 2.45 Inch Mini Phone Unlocked with ROM 1G RAM 8G (Gold) 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. Small as it is to be, still a full-featured Smartphone Integrated with all functions that an Android smartphone should have. Super Mini 3G Smartphone, Impossibly small. Amazingly cute. Totally functional. Extremely Portable, Handy and Simplicity, Fits the coin pocket on your jeans. Builtin Bluetooth enable you wirelessly connect to headphones, making it easier to your exercise. OS: Android 5.1