What's ultra-wideband (UWB)? It's a radio which utilizes a very low energy level for short range, high bandwidth communications. This would allow you to pinpoint exact location of other phones, key fobs or tracking tags, and more. Real world applications can also include determining where you parked, finding a lost dog, or interacting with smart devices by simply pointing to them.
Higher end phones started introducing this tech since Fall 2019 - here's a list of devices which have UWB (as of Jan. 16, 2021):
- iPhone 12 series
- iPhone 11 series
- HomePod Mini
- Watch Series 6
- Galaxy S21 5G series (only + and Ultra models)
- Galaxy S20 Fan Edition 5G Ultra Wideband (Verizon)
- Galaxy Z Fold 2
- Galaxy Note20 Ultra
I'll attempt to keep this list up-to-date and please send any feedback/comments to me on Twitter.