Zero-Energy Devices for 6G: First Real-Time Indoor Localization Thanks to Ambient Backscattering of Commercial 4G UEs. - Ahmed ElSanhoury; Islam Galal; Khaled AlKady; Ihab A. El-Khodary; Hashem Elbiali; Dinh-Thuy Phan-Huy; Ayman M. Hassan (EuCNC/6G Summit, 2025)