OnePlus is set to join the big leagues with the launch of its first foldable phone this year. Supposedly, this foldable will be based on the OPPO Find N, a China-exclusive device that launched to a very positive reception months ago.
https://www.notebookcheck.net/The-elusive-OPPO-Find-N-could-arrive-globally-as-a-OnePlus-foldable.612984.0.html