I Picked A Mobile From Another World

I Picked A Mobile From Another World summary:

I Picked a Mobile From Another World manhwa, In the midst of the devastation, only the soldiers' bones remained. It's only a matter of time before the entire world is annihilated. To avoid this, Kyung-Hoon began searching for clues in another universe with the help of a ten-year-old phone he discovered in an abandoned building.