False, this number is not CCB's phone at all ~ The number printed on the back of your credit card is the only customer service hotline of CCB's credit card, and the other 4 numbers are all false ~ And the outbound number of CCB is not 4~ The most important thing is that if your fixed limit can be adjusted, CCB will send a short message to inform you, and it will never call you directly. Moreover, such fraudulent phone calls and short messages will ask for your personal and credit card information, with the purpose of