Push-to-talk walkie-talkie features for your iPhone (pictures)

During your conversation, you can touch and hold the green button at the bottom to send a voice message in real time that is saved in your chat window.

You can send standard text messages, voice messages, and a fresh photo or one from your library.

In the message window, you can scroll through conversations, or replay audio messages you've sent and received previously.

Voxer Walkie-Talkie shares your GPS location on a map by default, and you can use pinch gestures to narrow it down to street level. I zoomed out here for the screenshot.

While fun for most conversations, you may want to turn the location features off. Go to settings, then select your account, and you'll find a switch where you can turn your location off.