About an hour later, in a briefing room a mere 10 feet below that keynote hall, AT Chief Technology Officer Andre Fuetsch told CNET, "The issue is devices.
After years of work on 5G networks, hyped as the life-changing foundation for tech trends like augmented reality and telemedicine, the super-fast wireless technology is finally being rolled out across the globe.
Samsung, the world's biggest smartphone vendor, unveiled the Galaxy S10 5G in February during its Unpacked event in San Francisco.
Oppo at MWC talked up its first, not-yet-named 5G phone.
In the US, Verizon turned on its 5G service on Wednesday in Chicago and Minneapolis.
The downside of that high capacity is limited range.