Elderly phone, you can let the family members who use smart phones around you or staff to help. You can bind the information of this old man in the young man's cell phone. The recent outbreak of the situation is more serious, that is, the amount of inquiries on the travel card suddenly increased, the pressure on the system service is constantly increasing. Sometimes there may be system lag, or not receive the verification code. Then we can use this method, that is, you can query by way of SMS. Trip code is communication big data trip card a code is also equivalent to the health code, is by the China Academy of Information and Communication Technology, China Telecom, China Mobile, China Unicom three basic telecommunication enterprises to use the data received by the cell phone, through the user cell phone is located in the location of the base station to obtain, for the country's 1.6 billion cell phone users free of charge to provide query services, cell phone users can be used through the service, to query the first 14 days of the person to all the cities and municipalities of the information. If no one accompanied, then let the elderly with a cell phone, when there is a need to sweep the code, the elderly can ask for the help of bystanders, the health code and trip code are placed on the desktop of the phone to facilitate the operation of the bystanders or staff will help to sweep the code.