Bank of China has two series of cards: Bank of China series and Great Wall series. Both series of cards can be used nationwide. The only difference is that the Great Wall series cards do not have any fees in the place where you want to use them. For example, For the Great Wall series you applied for in Shenzhen, there are no cash withdrawal fees, inter-bank fees, etc. within Guangdong. There are only interest on cash withdrawals, but there are handling fees in other places! However, the Bank of China series only has no fees within the bank, but there are fees for inter-bank and different places!