Say, "Adiós" for good-bye and "Hola" for hello.
Reply, "Me gustaría llamar con....." This is how you ask to speak to a specific person over the telephone. The answer will probably be "un momento, por favor" which means, "one moment, please" or "no está" which simply means, "he/she is not here."
Tell someone a call is coming in for them by using the phrase, "Hay alguien llamando para ti." (There is a call for you.) This is helpful when you answer the phone for someone else.
Ask, "¿Dónde está la cabina más cercana?" when you need to find a pay phone booth. Pay phones are located in many places throughout the Spanish speaking world, so this phrase will be useful when asking where the closest phone booth is located.
Get change for the pay phone by saying, "Perdón. Necesito cambio para el teléfono." (Excuse me. I need some change for the telephone.) The best place in Spanish speaking countries to get change is at a bank. It may seem rude to ask someone on the street for change for the telephone.