This mobile phone is an open version of att in the United States. It normally uses na5g millimeter wave in North America. I used na5g on a business trip in China recently. There were some problems. I found that only LTE, 5g did not know whether it was updated to the latest version of the system or the system of China Mobile Communications Corporation. I came to China on a business trip around August 2020. At that time, 5gna was still available, and now the experience makes me feel very bad.
