10085 is the customer service hotline of China Mobile. It is mainly used for marketing and customer service purposes. Representatives from 10085 may contact customers to introduce new services, promotions, and offers. They can also provide information about existing plans and answer questions related to mobile services. Sometimes, they may offer customized solutions based on a customer's usage patterns and needs. However, if you receive a call from 10085 and are unsure about its authenticity, you can independently verify the information provided or contact the official customer service hotline 10086 for confirmation.