Two-way radio service on a cellular phone is a walkie-talkie type feature that allows for you to push a button and be instantly connected to another party without having to make a phone call.  Once you finish speaking and release the button, the person on the other end can respond by pressing the button on their phone and speaking.  Advancements in two way radio services make it possible for you to communicate with friends and family across the United States.  Verizon wireless and Sprint together with Nextel, are two of the major service providers who offer two-way radio connectivity.