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Runbo X5 and X3 rugged Android phones moonlight as walkie-talkies, cost just $320
The best walkie-talkie apps for Android and iOS | Digital Trends
5 Best Walkie Talkie Apps for When You're Hiking
Using a cell phone as a two way radio: good idea or not? - Professional Wireless Communications
Samsung unveils new smartphone with Microsoft Teams walkie-talkie feature – GeekWire
Microsoft Teams turns your phone into a walkie-talkie | Ars Technica