[Secret Squirrel]

A little known feature that some Nextel phones have, it's called "DirecTalk". It is a walkie-talkie feature. It does not use the Nextel network. You should be able to talk direct to each phone or a group of phones that are set to specific channels and codes. It works similar to FRS radios but not using FRS frequencies. You will be able to see if your Nextel phone has this feature by going to the Main Menu and looking for the "Walkie-Talkie" or "DirecTalk" icon. If you find it, then you can use it and set each phone the same.
The only concern when using "DirecTalk" is you will not be able to receive phone calls or Direct Connect calls, because you are completely off the Nextel network. You will have to exit "DirecTalk" to resume normal operation.

I use Nextel phones for personal and work. We find this very useful at times when we have no signal and are working near each other. Line of sight rule is in effect.