F400 is the European version, and F408 is the Hong Kong bank. It seems that the 400 version is white and the 408 version is more stable than the 400 version. You can input Chinese on the Internet and QQ, and the phone book supports querying by pinyin initials, as well as intelligent Chinese input. Everything else is the same. F408 is recommended. I use f400, and I want to paint it as version 408.