Czy zostały dobrze uzyte czasy w tych zdaniach?

When I was walking to school, my phone rang.
When I was talking with my mother, my cat came to the room.
Kiedy otwierałam drzwi , kot wszedł do pokoju -> when I was opening the door my cat came to the room.

When I was walking to school, my 'phone' (telefon stacjonarny nie mogl zadzwonic bo jak, to co nosisz w rece to jest mobile) rang.
When I was talking with my mother, my cat came INto the room -ok.
(tutaj mozna dodac 'just') when I was opening the door my cat came INto the room.

dziekuje za pomoc :)