Sunrise is claiming a world record for speeds in the 3.5GHz band after hitting 3.28GBps in a demonstration with Huawei.
The Swiss operator showcased virtual reality, 360-degree panoramic live video and 12 parallel 4K video streams on 65-inch UHD televisions.
Sunrise is planning to implement 5G technology in the 3.5GHz band from 2020. It cited network slicing, low latencies of one millisecond, one million connections per square kilometre, and speeds of up to 10GBps as the key advantages of the technology.
The operator said one 5G wireless connection could replace fixed internet access across a 12-unit apartment block.
Sunrise and Huawei spent several weeks setting up the equipment for the demonstration, which required four tons of hardware, two cranes and an extra 50KW of power.
Sunrise CEO Olaf Swantee (pictured, right) used the demonstration to take a swipe at the country's spectrum policy. Rival Swisscom has also criticised Switzerland's regulation as overly strict.
Swantee said: "5G will be a game changer, and, to me, it's another important step up. Being the leading 4G provider, we naturally have high ambitions for the fifth generation of mobile phone technology as well.
"Once the world's toughest NIS regulations are finally relaxed and the spectrum is allocated in a competitive way, we will be able to do it and set new benchmarks with 5G yet again."
Last month, BT said it was planning to use 3.5GHz spectrum as part of a new testbed in Bristol.