"How fast! It takes only four or five seconds to download a high-definition movie. We live in border areas and high mountains. Now we can connect the world with 5g signals." With his newly bought 5g mobile phone, La Chunrong said excitedly that in the future, he would be more fluent in watching news and videos with his mobile phone, and he would be able to better learn Mandarin and new planting and breeding techniques. La Chunrong is a villager of kongdang village, Dulongjiang Township, Gongshan Dulong and Nu Autonomous County, Nujiang Lisu Autonomous Prefecture, Yunnan Province. On July 22, six administrative villages in Dulongjiang Township achieved full 5g network coverage. Dulongjiang township is the main settlement of Dulong People. As one of the ethnic minorities with a small population in China, Dulong has a population of about 7000, of which more than 4300 live in Dulongjiang township. At the beginning of the founding of new China, the Dulong People "crossed the millennium in one step" and directly transitioned from the end of primitive society to socialist society. The deep canyon in Dulongjiang township has very bad natural conditions. Before the Dulongjiang highway tunnel in Gaoligong Mountain was completed in April 2014, the mountain was closed by heavy snow for half a year. It was once the poorest and backward area in Yunnan and even the whole country. After receiving the letter, the general secretary immediately gave important instructions, pointing out that "the living conditions of the Dulong People are relatively difficult, and I have been thinking about your production and living conditions." he hoped that the Dulong People would "accelerate the pace of getting rid of poverty and becoming rich, and realize the beautiful dream of living a well-off life together with other fraternal nations in the country at an early date". At the end of 2018, the Dulong ethnic group lifted out of poverty, achieving the second historic leap from poverty and backwardness to a well-off society in all respects. Today's Dulongjiang Township, the highway tunnel has been connected to the southern power grid and used 5g signals. Witnessing the tremendous changes in the development of information and communication in Dulongjiang Township, Ma Chunhai, a native of Dulong ethnic group and deputy general manager of Gongshan branch of China Mobile Communications Group Yunnan Co., Ltd., sincerely lamented: "it is very difficult for commercial companies in the world to do such things with low cost performance. Only socialist countries led by the Communist Party have such determination and strength!" Common prosperity is the essential requirement of socialism with Chinese characteristics and an important feature of Chinese style modernization. The digital China Development Report (2021) released by the state Internet Information Office in July this year shows that China has built the world's largest and technologically advanced network infrastructure, realized "the same network and speed" in rural and urban areas, and reached 100% broadband access in administrative villages and poverty alleviation villages. Not long ago, the reporter walked into Dulongjiang Township and touched the strong pulse of the construction of an Internet power from the great changes in the border mountain township. A nation's "brief history of communication" -“