Resolution Problem and GameObjects look smaller in my android device

I am making an android game. I set the screen resolution to be 1080 * 1920 in unity. When I run the game by connecting the game through Unity Remote, the resolution looks the same in Android mobile. But, when I export it to APK format and when I install it in my phone and run, the gameobjects look so small. I don't know how to change it...Someone Please help!