YOU SAID:

i am giving my phone to my sister

INTO JAPANESE

私の妹に私の携帯電話を与えることです。

BACK INTO ENGLISH

It is giving my cell phone to my sister.

INTO JAPANESE

それは私の妹に私の携帯電話を与えています。

BACK INTO ENGLISH

It gives my sister on my mobile phone.

INTO JAPANESE

それは私の携帯電話で私の妹を与えます。

BACK INTO ENGLISH

It gives my sister on my mobile phone.