The Chinese company delivered 55,8 millions of devices, 5% less than last year, according to the research company. Huawei left Samsung in second place, which it sent 53,7 millions of smartphones, a drop 30% compared to the same period last year.
This is the first time Huawei has reached number one, and it is an ambition it has had for several years.
However, analysts doubt whether this was sustainable, given that Huawei's markets outside China have been hit by sanctions. America against the company.
The company sold more than 70% of its smartphones in China in the second quarter, while smartphone shipments in international markets fell 27% on an annual basis from April to June.
At Europe, a key area for Huawei, the company's smartphone market share fell sharply to 16% in the second quarter from 22% in the same period in 2019, according to Counterpoint Research.
Given China's massive population, success there often pushes companies into a large "world" market share.
«It will be difficult for Huawei to maintain its lead in the long run, "He said Mo Jia, analyst of Canalys.
"Its main partners in key regions, such as Europe, are increasingly cautious about using its devices. "Power in China alone will not be enough to maintain its position at the top as soon as the world economy begins to recover." he said.
In China, where Google services like gmail or the search engine is blocked, it is not something serious, as Chinese consumers are not used to using these products. However, in international markets, not having Google is a big blow.
This is one reason why Huawei rivals, who still have the ability to use Android on their devices, have increased their market share. For example, in Europe, the Chinese company Xiaomi saw its market share increase from 6% in the second quarter of 2019 to 13% in the same period this year, according to Counterpoint Research.
Huawei was forced to release its own operating system called HarmonyOS. However, analysts have previously questioned its success in international markets, as it lacks key applications from the App Store.
The Chinese telecommunications giant has faced further pressure from Washington this year. A new rule introduced in May requires foreign manufacturers using US chip production equipment to obtain a license before they can sell semiconductors to the company.
This could affect Huawei's ability to supply chips for its smartphones. It is also designing its own processors, manufactured by Taiwan's TSMC, which may be affected by the new legislation.