Rongcheng Credit Card of Bank of Communications is relatively easy to use, because there are still many rights and interests, such as: points can be exchanged for air miles, and the exchange ratio is 18: 1. You can participate in many credit card preferential activities, such as the fifth day of the Red Star Festival, the interest-free repayment period of up to 5 days, and you can take the subway and bus through the electronic cash function, but it is limited to Chengdu subway and some bus lines.