こわす
to break, to destroy, to smash
Somebody has put the thing back to being a pile of bits, on purpose or otherwise. The same ware わす as 壊れる, except this time a hand did it, and it was your phone: こわす.
壊れる こわれる is a thing breaking by itself. 壊す is somebody breaking it.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.