While mass market cellphones were still years away, the '80s had its own kind of wireless communication. Whether you spent the decade long-haul trucking with your primate companion or re-enacting episodes of "Hill Street Blues" in your backyard, you had a CB radio or walkie-talkie.
Today, you can make your smartphone function as a walkie-talkie in a number of ways. Voxxer, a free app for iOS and Android, allows you to hold down a button and send voice messages to all your friends, as long as they've signed up and logged in. CB Radio, another popular cross-platform app, maintains local group voice chat rooms that feel a lot like CB channels in the old days. If your business depends on walkie-talkie access, you can pay for Push 2 Talk service from one of the major carriers, but you will also need to buy your employees special phones that support it.