YOU SAID:
I walked home last night and lost my phone
INTO JAPANESE
私は昨夜家に歩いて私の電話をなくしました
BACK INTO ENGLISH
I walked home last night and lost my phone.
INTO JAPANESE
私は昨夜家に歩いて電話をなくしました。
BACK INTO ENGLISH
I walked home last night and lost my phone.
That didn't even make that much sense in English.