Connect your Samsung Galaxy A21s A217F to the PC via a USB cable. Head over to the PC and open Device Manager. If your device is located there, run the UFi Box. Step 1 Run Android Lock Screen Removal Tool. Open Lock Screen Remoal program on your computer. Then select Android Lock Screen Removal mode. Step 2 Start the Removal Process.. What is the difference between Samsung Galaxy A21s and Samsung Galaxy J6 Plus? ... PLS (Plane-to-Line Switching) is a type of IPS screen developed by Samsung , with increased brightness and lower production costs. 4. pixel density. 270ppi. 274ppi. ... Galaxy S10 Plus 128GB - White - Locked S... Galaxy S10 Plus 128GB - White - Locked Sprint: $295.