The Government of Rwanda and SoftBank Corp. announced that on September 24, 2023, they successfully tested SoftBank's proprietary 5G communications payload in the stratosphere installed on a solar-powered High Altitude Platform Station (HAPS) unmanned aerial vehicle (UAV) prototype.

・Press Release
https://www.softbank.jp/en/corp/news/press/sbkk/2023/20231017_02/

・Press release at MWC
https://www.mwckigali.com/press-releases/government-of-rwanda-in-partnership-with-softbank-corp-successfully-delivers-worlds-first-5g-connectivity-from-the-stratosphere