Why does Sony z3 have au and other versions? What do you mean?

There are three operators in Japan, and au is one of them. Operators are all contract machines, and the price will be much cheaper. However, if you buy it back, you need to unlock the network, which means you can't use a domestic card. If you buy them online, buyers will usually solve them. There will be several applications in the mobile phone that can't be used in China, and others are very different from those in the Bank of China.