Janizz Black Unlocked Simple Big Button Gsm Mobile Cell Phone for Seniors. Great Phone and Very Simple to Use UNLOCKED FOR ALL GSM CARRIERS,DUAL SIM (INCASE YOU HAVE TWO NUMBER) VERY SIMPLE TO USE,GREAT FOR SENIORS AND ELDERLY OR VISUALLY CHALLENGED (SPEAKS THE NUMBER WHEN PRESSED) SOS BUTTON ON THE BACK(CAN TEXT PRESTORED NUMBERS AND ALSO AMBULANCE SIREN TO ALERT PEOPLE AROUND) WORKS WORLD WIDE 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. SAME DAY SHIPPING