To place a reverse-charge call, also known as a collect call, you must first call a company that offers this service. AT&T, 1-800-COLLECT and Skype are companies that offer reverse-charge calling.
To place a reverse-charge call, dial the phone company's toll-free number, then enter the number you'd like to call, either through an automated system or with the assistance of an operator. You will be asked for your name, and the phone company will dial the number for you. Once the other person picks up, he will be told who is calling and asked if he would like to accept the charges. If he accepts, you'll be connected and your phone call will proceed as normal. In accepting the call, he assumes responsibility for the cost of the call once it is complete.