T-Mobile is the first network operator to offer voice over 5G

Voice over 5G (also known as Voice over New Radio, or VoNR) is a huge problem for the whole wireless industry, though all US carriers will most certainly want to transition voice calling to 5G at some point in the future in order to free up LTE spectrum for 5G. Voice calls via 5G have decreased latency, therefore there are actual benefits for customers.