The company relied on Chinese chipmaker Semiconductor Manufacturing International Corp., or SMIC, to make the chips in the Mate 60 Pro. SMIC, which is partly state owned, is the only maker of advanced chips in China. Analysts said they believed Huawei had again turned to SMIC for the Mate 70. Huawei did not reveal details about the chips in the new phone.

A critical question is how advanced the chips are because that can determine whether they can perform more sophisticated tasks such as AI at a faster speed.

US officials seeking to control China’s chip development say advanced technology is essential not just for consumer technology such as chatbots but also for military superiority. They have tried to prevent Chinese companies from buying these kinds of chips and related machinery, leaving SMIC dependent on dated tools.

Experts say SMIC has strained to make enough chips for Huawei. Even though production for some parts in Huawei’s latest phones began in July, the Mate 70 has not gone on sale until now because it has been challenging for Huawei to acquire enough chips, said Lori Chang, a senior analyst at Isaiah Research, a market research company.

SMIC did not respond to a request for comment.

As of Tuesday, more than 3 million people had signed up on Huawei’s website to reserve the company’s latest flagship phone, which does not require a deposit. The premium version of the Mate 70 is set to go on sale in China on Tuesday, according to Huawei’s website.

In 2022, three-quarters of the high-end smartphones sold in China were iPhones.

Huawei has been working for years to position itself as synonymous with the country’s tech industry, as Apple is with Silicon Valley. Resurgence despite Washington’s controls is a crucial part of this image.

A top Huawei executive, Meng Wanzhou, became a hero to many in China after her return in 2021 following almost three years of detention in Canada while facing fraud charges in the United States. A series of trade restrictions against Huawei first put in place during the Trump administration pummeled its profits in 2022. Since Meng’s release, Huawei has expanded its product range and developed some of China’s most advanced AI technology.

Over the past two years, the company has steadily gained ground in China’s smartphone market.

In 2022, three-quarters of the high-end smartphones sold in China were iPhones. This year, it was just about half as Huawei’s share more than doubled, according to Canalys, a market research firm.

“Huawei’s goal over the past few years has been consistent — to reclaim some of the market share that iPhone holds in China,” Chang said.

Huawei faces stiff competition from domestic rivals such as Xiaomi and Oppo, which sell less expensive devices. To compete, Huawei will have to sell more midrange models, too, said Toby Zhu, a senior analyst at Canalys.

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But even those devices will require a large number of chips. And as foreign chipmakers such as the Taiwan Semiconductor Manufacturing Co., or TSMC, stop sending chips to Chinese clients, this could become increasingly difficult as more companies will depend on SMIC for advanced chips.

“Not only Huawei but now all China-based AI makers, they face the same issue,” said Linda Sui, a senior director at TechInsights, a market research firm.

“If they all ship through SMIC, that’s going to make the supply constraints even worse next year.”

This article originally appeared in The New York Times.

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