BlackBerry Q5 Unlocked for all GSM Carriers Worldwide Smartphone - International Version - White Cellular Band - GSM Edge 850 / 900 / 1800 / 1900 Mhz Cellular Band - HSDPA 850 / 900 / 1900 / 2100 Mhz 2GB RAM, 8GB Memory, Supports Micro SD Card QWERTY Keyboard 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.