Mobile phone chipmaker Qualcomm Inc may be facing tough headwinds in China after a telecommunications trade union submitted "substantial evidence" to the country's top economic planner in the midst of an antitrust probe.

Mobile Phone China Alliance, comprising some 30 handset makers and telecommunications equipment providers, has submitted an investigative report to the National Development and Reform Commission, calling Qualcomm's business model "detrimental to China's mobile phone industry".

Overcharging on patent fees and bundle-selling of services are two major accusations leveled at the world's largest chip manufacturer, according to the alliance's secretary-general, Wang Yanhui.