YOU SAID:

my phone is off and will stay off until i charge it.

INTO JAPANESE

私の携帯電話はオフで、私はそれを充電するまでオフのままになります。

BACK INTO ENGLISH

My phone is off and will remain off until I charge it.

INTO JAPANESE

私の電話はオフになっていて、充電するまでオフのままです。

BACK INTO ENGLISH

My phone is off and remains off until it charges.

INTO JAPANESE

私の携帯電話はオフで、充電されるまでオフのままです。

BACK INTO ENGLISH

My phone is off and will remain off until it is charged.

INTO JAPANESE

私の携帯電話はオフで、充電されるまでオフのままになります。

BACK INTO ENGLISH

My phone will remain off until it is turned off and charged.

INTO JAPANESE

私の携帯電話は、電源が切れて充電されるまでオフのままになります。

BACK INTO ENGLISH

My phone will remain off until it is turned off and charged.