YOU SAID:
Im use ING someone else's phone
INTO JAPANESE
他人の携帯電話を使用しています
BACK INTO ENGLISH
Using someone else's mobile phone
INTO JAPANESE
他人の携帯電話を使用する
BACK INTO ENGLISH
use someone else's cell phone
INTO JAPANESE
他人の携帯電話を使用する
BACK INTO ENGLISH
use someone else's cell phone
That didn't even make that much sense in English.