The first thing the Back button does, as you might expect, is take you back one screen from where you are. Your phone remembers all the apps and websites you've visited since the last time your screen was locked and will take you back one page each time you press Back, until you get to the Start screen.
Ang unang bagay na ginagawa ng button na Bumalik, tulad ng maaaring inaasahan mo, ay ibalik ka nang isang screen mula sa kinaroroonan mo. Tinatandaan ng iyong telepono ang lahat ng app at website na binisita mo simula noong huling beses na nai-lock mo ang iyong screen, at dadalhin ka pabalik nang isang pahina sa bawat pagkakataong pindutin mo ang Bumalik, hanggang sa makabalik ka sa screen ng Simula.