Normal walkie talkies have much higher powers and/or different frequencies. Most cell phones already have Wifi, we would need a mesh (or at least special ad-ho

Normal walkie talkies have much higher powers and/or different frequencies. Most cell phones already have Wifi, we would need a mesh (or at least special ad-hoc) standard for this and there you have your walkie talkie functionality with a bit of software. There has been little success pushing one of those as apparently nobody cares about this feature.