GSM Big Button Mobile Phone for Elderly, Dual SIM Unlocked Senior Mobile Phone With Charging Dock, Torch, FM Radio, Easy to Use Basic Cell Phone 1)GSM Networks : Unlocked Dual SIM Free Seniors Mobile Phones.This mobile phone is a non-contract GSM mobile phone (850/900/1800/1900MHz ), compatible with all GSM networks (except 3G/4G networks), making calls and receiving text messages, simple mobile phone for the elderly. 2) SOS Emergency Button:5 SOS calling numbers and 8 speed dial can be set. In an emergency, press and hold the SOS button of this senior simple feature phone for 3 seconds to get help from families or friends. 3) Multifunctional: Making calls, MMS/SMS; SOS emergency button; Speed dial; Alarm clock; Bluetooth; Calendar; Calculator, Torch, etc.