The phone bill was exceptionally high

The phone bill was exceptionally high. The man of the house called a family meeting to discuss.

Dad: This is unacceptable. I don't use the home phone. I use my work phone.

Mum: Me too, I hardly use the home phone. I use my company's phone.

Son: I use the cell phone given to me by my office. I never use the home phone.

All of them shocked and together look at the maid who is patiently listening to them.

Maid: What? so we all use our work phones. What's the big deal??