Samsung S5260 Star II Black WiFi Unlocked GSM QuadBand Cell Phone Star Reloaded with Social Networking Full Social Networking with Fast & Easy Access Intuitive Touch Experience Mobile Amenities that Enhance Performance Office Productivity to Go 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.