Huawei now sells over 70 percent of its smartphones in the Chinese mainland.
Huawei said in a statement it was a sign of "exceptional resilience".
Huawei released its Mate 30 in the United Kingdom for £899 back in February - its first smartphone made without access to Google apps due to the USA ban.
On Wednesday, the USA ambassador in Brasilia warned of "consequences" if Brazil chooses Huawei for the project to develop the next generation of telecommunications technology in Latin America's most populous country.
Another victor in the second quarter was Apple, which finished fifth in China, as the USA tech giant achieved the highest year-on-year smartphone shipment growth of 35% with 7.7 million units.
"If it wasn't for COVID-19, it wouldn't have happened", Canalys senior analyst Ben Stanton said.
But Huawei still took the title thanks to robust sales in its home market, where demand has recovered faster than elsewhere. The good news for Huawei has been China. However, since then, Apple has bounced back with strong sales for both the iPhone 11 and the iPhone SE (2020), which arrived in April this year.
It's obviously a unique set of circumstances and it will be hard for Huawei to maintain its lead in the long term as global markets start to bounce back. The company sold 57 million smartphones and 7 million tablets in the second quarter. "As a result, it is important for the Chinese company to maintain good relations with Qualcomm so as to reduce future risks", Jia said.
In total, Huawei shipped more than 55.8 million devices in the second quarter of this year. "The price of 5G phones is also trickling down with Huawei, OPPO, vivo, Xiaomi all having 5G smartphones at mid-tier price points", Kumar said. And when a country is shut down, it's a little hard to ship smartphones in. So for all intents and purposes, it's business as usual for Huawei in the country, and with the market accounting for 369 million phone shipments in 2019, there's plenty of room for Huawei to grow. They're not indicative of any sizable gains by Huawei; in fact, the Canalys data suggests Huawei saw an overall sales decline of 5% from a year ago.