BLU Q51 Green Samba JR Unlocked Quad-Band Dual SIM Phone with QWERTY Keypad, FM Radio and MP3 Player - US Warranty This unlocked cell phone is compatible with GSM carriers like AT&T and T-Mobile. Not all carrier features may be supported. It will not work with CDMA carriers like Verizon Wireless, Alltel and Sprint. Unlocked Quad-Band GSM cell phone compatible with 850/900/1800/1900 mHz frequencies (both SIMs) plus GPRS/WAP data capabilities. QWERTY Keyboard; Social Networking Integration; Stereo FM radio; MP3 player; MP3 ringtones and MicroSD slot upgradeable up to 8GB. Dual SIM, Games; Browser WAP 2.0/xHTML; SMS; MMS; Organizer; GPRS Class 10 (4+1/3+2 slots), 32 - 48 kbps; Internal Memory 64 MB + 32 MB and MicroUSB v2.0. Talk time up to 8hrs - Stand-by up to 600hrs.