It seems that the upcoming Samsung Galaxy S10 flagship smartphones could feature reverse wireless charging. Thanks to a photo of what looks like a demo booth controller, speculation has risen that the South Korean manufacturer will take a leaf out of Huawei's book and include the capability to wirelessly charge other phones with its much-anticipated devices.
https://www.notebookcheck.net/Demo-booth-photo-suggests-Samsung-Galaxy-S10-range-will-support-reverse-wireless-charging.400676.0.html