The Apple Watch does more than just clock. You can use it to make phone calls, send text messages and write e-mails. You can listen to music, tune in to your favorite podcast and even watch your sleep.
With the watchOS 5 update you can now communicate your device with other Apple Watch users via the walkie-talkie function. As long as you and your friend both have watchOS 5 or higher, you can talk and hear directly through your watch via walkie-talkie ̵
The good news is that both Wi-Fi only and cell-powered watches can use this feature. Either connect to a nearby Wi-Fi network or use your data plan to make a call from your Apple Watch, and you do not even have to worry about your phone. The only catch is that walkie-talkie uses FaceTime audio for communication, so you also need to set up FaceTime on your phones to connect your devices.
Note that the setup and interface for walkie-talkie is clumsy It only works with the Apple Watch. You can not use it to talk to someone on an iPhone or iPad. Hopefully, Apple will improve and improve the app over time, but despite its limitations, walkie talkie is worth a round.