Wasana Mobile - Specification overview Samsung Galaxy A21s is a Single SIM (Nano-SIM) or Dual SIM (Nano-SIM, dual stand-by) Phone from Samsung. Device runs on Android 10, One UI 2.0 powered by
Samsung Adds the New Galaxy A21s to the Galaxy A Family – Samsung Newsroom U.K.
Amazon.com: A21s Dual Sim Card Tray,MicroSD Card Slot Holder Replacement for Samsung Galaxy A21s A217 6.5 Inch (not ok for Single Version) (Black) : Cell Phones & Accessories