They could not hear my mobile phone

My mobile phone has been a trial
The other could not hear me
I could have run a million miles
Carrying tote bags filled with files
My mobile phone has been on trial
It seemed ok what e’re I dialled
I bought a plastic case,you see
It covered up the microphone
And turned all humans into stone
Hardware problems it cannot be
My mobile phone has been a trial
No foe or friend could hear me