Protesters say the attitude of Motorola's management, combined with the massive scale of the layoffs, had forced them to take to the streets.
Journey from the top Layoffs spark protest
Motorola employees in Nanjing and Beijing have protested against the decision by its owner Google on Monday to reduce the workforce by 20 percent.
China has been the largest source of the sales slump in Nokia's global layout.
Apple Inc plans to add the search service of Baidu Inc to iPhones sold in the country, part of its effort to cash in on the Chinese market.
Apple Inc is considering opening two new stores in China. Chengdu, Shenzhen likely to host technology company's new outlets.
Google Inc won approval from Chinese regulators for its $12.5 billion purchase of Motorola Mobility Holdings Inc, the Ministry of Commerce said in a statement.
Samsung Electronics Co Ltd said it aims to capture more than one-third of China's entry-level smartphone market this year, according to the senior vice-president of Samsung China.
The new Lumia lineup has failed to become the white knight riding to the rescue of the troubled handset maker Nokia Oyj.
International mobile phone companies have begun selling low-priced smartphones in China as they struggle to turn the tide in their battle with their Chinese rivals.
Samsung Electronics Co, Asia's largest consumer electronics maker, announced on Tuesday it will open a memory chip factory valued at $7 billion in Xi'an, Shaanxi province, its largest ever overseas investment.
The number of users of third-generation (3G) telecommunication services in China is expected to grow rapidly and surpass 230 million this year, which will help the country to remain one of the world's strongest smartphone markets.
Among Motorola Mobility Holdings Inc's more than 17,000 patents, a group of 18 may prove most useful in Google Inc's effort to fend off litigation targeting the Android mobile platform.