Has anyone used the Apple 6th version of the card application machine? Is there anything I can’t use?

The Japanese version of Apple has relatively weak signals in China and basically does not have 4G, at most 3G.

The reason why the Japanese version of iPhone 6 cannot be used is because the signal of the Japanese version of the mobile phone in China is very weak. It has nothing to do with the sim card. Pulling the iron will definitely be useful. Because there are many reasons, the phone itself is not suitable for use in China, or the signal is weak, or the network is not good, etc. It is all related.