Samsung Galaxy Young GT-S6310L factory Unlocked - White 2G Network GSM 850 / 900 / 1800 / 1900 3G Network HSDPA 850/1900 Internal 4 GB, 768 MB RAM Primary 3.15 MP, 2048x1536 pixels Android OS, v4.1.2 (Jelly Bean) 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.