A collect call in Canada, Pakistan, and the United States, known as a reverse charge call in the majority of the English-speaking world, is a telephone call in which the calling party wants to place a call at the called party's expense. In the past, collect calls were only possible as an operator-assisted call, but with the introduction of computer-based telephone dialing equipment, it is now possible to place a collect call without using an operator, which is called automated operator services (AOS) as opposed to Home Country Direct (HCD). Several companies offer services to place collect calls that compete with local service providers. Collect calls can be made from almost any public pay telephone in the world by following directions posted on or near the phone. Collect calling has been in constant decline since the advent of cellular phones and VOIP products, which can offer cheaper international rates.