Walkie talkie doesn't work, due to the fact that when you'll change your Channel of communication ( Direct Communication, Side channel, Global channel) it doesn't change at all, the only available option is the Direct Communication channel.
- Legacy ID
-Have a Walkie Talkie with full battery in
-(OPTIONAL)Press the "ON" button, with the selected frequency to its side
-Try to change the channel (Default key is "," and ".")
-Get a little rectangular message indicating you're in Direct Channel, NOT in the respective frequency chosen before.
It used to work in the first versions of the game.