Millions of people have a BT phone line and still pay BT for the line rental but save money by using a different provider for their phone calls.
Others choose to move entirely to another home phone or broadband provider because of the exra savings they are offered on the service charges and line rental.
In an attempt to persuade you to try their products and services, many providers will also offer you the chance to pay less by offering you free phone calls and even free home broadband services.
Many people who find that most of the everyday phone calls they make are to mobile phones owned by family members and friends are also choose to make significant savings by converting the home phone connection to a mobile connection.