YOU SAID:
This phone is lost. Please help give it back.
INTO JAPANESE
この携帯電話は、失われます。それをお返しください。
BACK INTO ENGLISH
This phone will be lost. Please return it.
INTO JAPANESE
この携帯電話は、失われます。それを返してください。
BACK INTO ENGLISH
This phone will be lost. Please return it.
That didn't even make that much sense in English.