How can I push to talk (PTT) on the iPhone?
Remember people with Nextel phones, beeping everywhere and chatting just like they were using a portable two-way radio? Now you can simulate this fun with your iPhone thanks to a variety of apps.
Push-to-talk (PTT) capabilities are possible using many apps, including the following software available on the App Store for free:
2. iPTT push-to-talk
3. TiKL - Touch to Talk
4. Voxer Walkie-Talkie PTT
5. Walkie Talkie - Wifi & Bluetooth
6. Zello Walkie Talkie
Anonymous replied on Permalink
Try SnapTalk voice...it is easy to use & simplest solution. www.getsnaptalk.com