The iPhone 12’s mysterious groove is a 5G mmWave antenna window — and it’s exclusive to the US
3:45pm PDT - October 13th, 2020 iphone 12 - The VergeThe iPhone 12 doesn’t support mmWave 5G outside of the United States. Here, it has a special window for mmWave signals, and it appears to be designed so users can visibly see it and perhaps avoid holding it there for maximum signal strength.