Nokia XL Dual SIM Unlocked Smart Phone RM-1030 Dual Core 4GB Black Nokia Lumia XL Dual SIM Unlocked Smart Phone RM-1030, Black 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.