I'm going to keep my phone on when my mum was talking to me
Why are you deciding to keep your phone on?
I don't like my mum's voice, I can't stand to listen to it.
That seems very harsh. She is your mother and she deserves your respect. It would be more considerate if you turn your phone off when talking to her.
She's always talking anyway, what difference does it make?
I know you're frustrated, but try to be patient with her. She probably doesn't understand that you're annoyed with her and it might upset her if you're rude to her.