6splus doesn't open traffic, can't receive SMS?

No matter which generation of Apple mobile phone, whether it can open traffic has nothing to do with SMS.

But it is impossible to send and receive iMessage information without traffic and Wifi network.

IMessage is an instant messaging software launched by Apple, which can send short messages, videos and so on. It has high security. IMessage is different from SMS/MMS service of operators. Users only need the data support of WiFi or 3G network to complete communication. IMessage uses the new message reminder system of iOS and Mac os, which can directly push information to the other party's screen, regardless of whether the other party is in the game or locked. If both parties are using iMessage, you can even see the state of each other's speech.