YOU SAID:
my phone is on my pocket
INTO JAPANESE
私の電話はポケットにあります
BACK INTO ENGLISH
My phone is in my pocket
INTO JAPANESE
携帯電話がポケットに入っている
BACK INTO ENGLISH
Mobile phone is in my pocket
INTO JAPANESE
携帯電話がポケットに入っている
BACK INTO ENGLISH
Mobile phone is in my pocket
That didn't even make that much sense in English.