Fsmart M5 Plus Unlocked GSM 2G Mini Phone 0.23 Inch Slim Bank Card Size Mobile Phone (White) Ultra Mini Size--3.5x 2.0x 0.23, available to keep in your wallet pocket even your notebook. Stable Quality--MediaTek Processor, basic stable performance for more than 10 years. NOTHING can expect from this phone beside CALL and TEXT, time goes back to 80s. Long standby batteryeven only 320Mah polymer battery, but it can stand by for 4-5 days. great spare phone. Quadband unlocked phone850/900/1800/1900 GSM band, 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, Pure Talk USA Boost or Virgin.