BLU Hero JR S250 Unlocked GSM Dual-SIM Cell Phone - Yellow 2G: GSM 850 / 900 / 1800 / 1900 (SIM 1 & SIM 2) 3.5" TFT Touchscreen FM Radio, Music Player, Video Player, and BLU Chat 1.3 Megapixel Camera (1080 x 1024 pixels) + Video Internal Memory: 64 MB RAM + microSD Slot Expandable up to 32GB 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.