Officials from the public security, traffic, and industry and commerce authorities visited Uber's office yesterday night and seized numerous iPhones, the Guangzhou-based Southern Metropolis Daily said.
The newspaper said authorities carried out the raid on the basis of their oft-repeated statements that the use of private vehicles for ride-sharing businesses is illegal in China, even as the popularity of Uber and its competitors soars.
US-based Uber, which puts customers in touch with private drivers in an alternative to traditional taxis, has become the focus of global controversy and is facing legal challenges and limits on its activities.
Guangzhou authorities issued no public statements on the reported raid.
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Uber said in response to a query from AFP that it is cooperating with local officials, though stopped short of confirming the reported raid.
"Uber prides itself on providing efficient and convenient transportation options for riders to get from point to point, helping cities reduce congestion pollution," it said.
"We have maintained open channels of communications and are working closely with local authorities in cooperation."
The popularity of private-car booking enterprises such as Uber and China's dominant taxi-hailing apps Kuaidi Dache and Didi Dache has soared in China, where traditional taxis are criticised for poor service with rude drivers who routinely pass customers on the street.
"Uber is more convenient than taxis, with good service," posted one user. "People need it."
Another suggested that Uber's popularity didn't sit well with traditional services.
Uber "has hurt some groups' interests and surely will be attacked", the post said.
Uber currently operates in nine cities across China, including the capital Beijing and financial hub Shanghai.
Chinese search engine Baidu, the country's equivalent of Google, said in December it had purchased a stake in the company.