The call, using a test network, took place in Spain just ahead of Mobile World Congress which starts on February 26.
The standards organisation 3GPP agreed the Non-standalone global standard for 5G as part of its ‘Release 15’ in December 2017.
In the test, a dual connectivity 4G to 5G live data call was completed using a test device. The connection started on 4G and then established the data connection on 5G. The engineers also successfully tested a live HD video call using the same route.
Follow this link to read the full blog post: http://www.vodafone.com/content/index/what/technology-blog/5g-nsa-standard.html