Roger
Our phones are great communication tools, but the traditional phone call is terribly inefficient — both people have to be available, and productivity grinds to a halt while you're talking. Roger lets you keep in touch with friends and family on an on-demand basis. Built by the people behind Spotify, you simply enter the person's phone number, tap to talk, and then tap to listen when they reply. It's a modern-day walkie talkie, no unsightly antennas required.