The Phone bill was exceptionally high

The phone☎ bill was exceptionally high. Man called a family meeting to discuss.
Dad: This is unacceptable. I don't use home phone, I use my work phone.
Mum: Me too. I hardly use home phone. I use my companies phone
Son: I use my office mobile, I never use the home phone.
All of them shocked and together looked at the maid who's patiently listening to them.
Maid: "What? So we all use our work phones. What's the Big deal??