OPPO has announced that it has been successful in a test involving using WeChat for a video call over 5G. It was made using a phone customized with 5G-compatible hardware. This breakthrough puts the Chinese OEM one step closer to commercializing hardware based on the new radio standard.
https://www.notebookcheck.net/OPPO-claims-to-be-world-first-to-conduct-5G-video-call.373861.0.html