China's National Development and Reform Commission (NDRC) has launched a nationwide campaign to reduce illegal telecommunications and postal fee charges.

A nationwide survey, which would last until August 30, would cover fee charges of all business or agents engaged in basic telecommunications services, value-added services and postal services since January 1, 2007, the NDRC said in a statement.

Inspectors would look for improprieties, such as illegal pricing and excessive fee charges, it said.

Some content service providers in China have been found to overcharge their customers, said the commission.

The NDRC lowered the country's mobile roaming service charges from March 1 under consumer pressure to entirely abolish them.