What Walkie Talkie Apps Are There?

So I like to ride my quad and dirtbike with my friend a lot, but communication is obviously hard to come by on those things so I wanted to come up with a way to wirelessly communicate. I was thinking, I have an iPhone and iPod touch 4g, so are there any apps that could use (not Wi-Fi) but either Bluetooth or wireless frequency that is like a walkie talkie where I could use the headphones with the microphone to communicate. If not, does anyone know of any devices or walkie talkies with headphones in which I could do the same thing, without pressing any buttons.

Voxer

The Voxer Walkie Talkie APP. Works for iPhones and iPod's.

Check out the link below.

Voxer is through cell towers, so yes if thats what you want

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