Dear, if you want to buy an iPhone5S contract machine online in the online business hall of China Unicom, you can pay by credit card, which is not supported by China Merchants Bank. At present, the online business hall of China Unicom only supports these four banks: China Industrial and Commercial Bank, China Bank, China Agricultural Bank and China Construction Bank. (Note: Due to the upgrade of ICBC system, the installment payment business of ICBC in Unicom's online business hall was suspended).

Whether the specific physical business hall is the same as the online business hall, you need to consult the local Unicom business hall to see if you can use China Merchants Bank credit card to purchase iPhone contract machines in installments.