Csours explained it. For a while, when nextel disappeared and the PTT bandwidth got reallocated, the other carriers tried to sell "PTT" as well, but it was con

Csours explained it. For a while, when nextel disappeared and the PTT bandwidth got reallocated, the other carriers tried to sell "PTT" as well, but it was contained in an app like Zello (or their own proprietary app). Old Nextel PTT phones had dedicated hardware buttons specifically for it. So you didnt' have to unlock a phone, find the app, open it, etc. Your phone was a walkie talkie.