Hi, Mr hunk. Do not answer the phone and never call back. 0755 is the area code of Shenzhen and 75511 should be the service phone number of China Ping'an Insurance Company. Many people are disturbed by this call including me. It seems to be a sale promotion and investigate you by ask some questions, such as how do you get to work, by bus or drive yourself, which bank you think offer the best service. Usually a service number is shown without the area code, for it is applied to any cities in the country. Anyway, ignore it.