Product quality is generally appraised by professional judicial institutions, and judicial appraisal of product quality refers to the quality appraisal of goods by some organs or units. Only provincial and national quality and technical supervision administrative departments can accept quality appraisal applications. The quality appraisal shall be organized and implemented by the appraisal institution designated by the above-mentioned administrative department of quality and technical supervision.

If consumers encounter quality problems when buying mobile phones, they can choose to complain to the local market supervision bureau or the local administrative department for industry and commerce. Consumers can also choose to complain to organizations authorized by law, such as the Consumer Protection Association. Consumers must complain in time when they find quality problems, safeguard their rights and protect their legitimate rights and interests.